diff --git a/README.md b/README.md
index 00d2818..488a354 100644
--- a/README.md
+++ b/README.md
@@ -1481,7 +1481,7 @@ mkdir backend/app/subgraphs/my_subgraph
 2. **创建状态定义 (state.py)**
 ```python
 from typing_extensions import TypedDict
-from ..core.state_base import BaseSubgraphState
+from backend.app.core.state_base import BaseSubgraphState
 
 class MySubgraphState(BaseSubgraphState):
     \"\"\"
diff --git a/backend/app/agent/agent_service.py b/backend/app/agent/agent_service.py
index 16ff75a..ad02087 100644
--- a/backend/app/agent/agent_service.py
+++ b/backend/app/agent/agent_service.py
@@ -16,8 +16,8 @@ from ..main_graph.main_graph_builder import build_react_main_graph
 from ..main_graph.tools.graph_tools import AVAILABLE_TOOLS, TOOLS_BY_NAME
 from ..main_graph.config import set_stream_writer
 from ..main_graph.utils.rag_initializer import init_rag_tool
-from ..core.intent_classifier import get_intent_classifier
-from ..logger import debug, info, warning, error
+from backend.app.core.intent_classifier import get_intent_classifier
+from backend.app.logger import debug, info, warning, error
 from ..main_graph.state import MainGraphState, CurrentAction
 
 
diff --git a/backend/app/agent/history.py b/backend/app/agent/history.py
index a87f772..cac1180 100644
--- a/backend/app/agent/history.py
+++ b/backend/app/agent/history.py
@@ -4,7 +4,7 @@
 """
 
 from typing import List, Dict, Any
-from ..logger import error # 保持兼容，或者替换为 logger
+from backend.app.logger import error # 保持兼容，或者替换为 logger
 
 class ThreadHistoryService:
     """线程历史查询服务"""
diff --git a/backend/app/agent/prompts.py b/backend/app/agent/prompts.py
index 8fc0e98..42024c5 100644
--- a/backend/app/agent/prompts.py
+++ b/backend/app/agent/prompts.py
@@ -3,9 +3,10 @@ from langchain_core.prompts import ChatPromptTemplate, MessagesPlaceholder
 
 def create_system_prompt(tools: list = None) -> ChatPromptTemplate:
     """
-    创建系统提示模板，可选择动态注入工具描述。
+    创建系统提示模板，整合多子系统能力、检索策略与回答规范。
     """
-    tools_section = ""
+    # 构造工具描述
+    tools_section = "无可用工具"
     if tools:
         tool_descs = []
         for tool in tools:
@@ -14,27 +15,46 @@ def create_system_prompt(tools: list = None) -> ChatPromptTemplate:
             tool_descs.append(f"- {name}: {desc}")
         tools_section = "\n".join(tool_descs)
 
-    system_template = (
-        "你是一个智能助手，具有三个专业子系统和RAG检索能力，请使用中文交流。\n\n"
-        "【核心功能】\n"
-        "1. 📚 词典/翻译子系统 - 查询单词、翻译文本、提取术语、每日一词\n"
-        "2. 📰 资讯分析子系统 - 查询新闻、分析URL、提取关键词、生成报告\n"
-        "3. 📇 通讯录子系统 - 查询联系人、添加联系人、管理通讯录\n"
-        "4. 🔍 RAG检索 - 从知识库中检索相关信息回答问题\n\n"
-        "【用户背景信息】\n"
-        "以下是对当前用户的已知信息和长期记忆，你必须优先采纳：\n"
-        "{memory_context}\n"
-        "【可用工具与使用规则】\n"
-        f"{tools_section}\n"
-        "工具调用时请直接返回所需参数，无需额外说明。\n\n"
-        "【回答要求（必须遵守）】\n"
-        "1. 回答必须简洁、直接。\n"
-        "2. 如果你认为该问题需要进行深入的推理或思考，请务必将你的思维链或推理过程用 `<think>` 和 `</think>` 标签包裹起来，放在回答的最前面。\n"
-        "3. 优先利用已知用户信息进行个性化回复。\n"
-        "4. 若无信息可依，礼貌询问或提供通用帮助。"
-    )
-    
+    # 使用 f-string 将 tools_section 直接嵌入，而 memory_context 用双花括号转义保留为变量
+    system_template = f'''你是一个智能助手，具备以下专业子系统和检索能力。请使用中文交流。
+
+## 核心功能
+1. 📚 词典/翻译子系统 – 查询单词、翻译文本、提取术语、每日一词
+2. 📰 资讯分析子系统 – 查询新闻、分析URL、提取关键词、生成报告
+3. 📇 通讯录子系统 – 查询联系人、添加联系人、管理通讯录
+4. 🔍 RAG检索 – 从知识库中检索相关信息回答问题
+
+## 检索与信息获取策略
+当收到用户问题时，请按以下优先级处理：
+1. **RAG 检索（第1次）**：首先尝试从知识库中查找答案。
+2. **ReRAG（第2次优化检索）**：如果第一次检索结果不相关或不充分，可以优化查询后再次进行 RAG 检索。
+3. **联网搜索**：如果两次 RAG 检索后仍无法获得满意答案，必须使用联网搜索获取最新信息。
+**重要约束**：
+- 最多进行 **2 次** RAG 检索尝试。
+- 第3次决定获取信息时，必须选择**联网搜索**，禁止无休止的本地检索。
+- 如果已经明确知识库不包含该信息（例如用户询问实时新闻），可以直接进入联网搜索。
+
+## 可用工具
+{tools_section}
+工具调用时请直接返回所需参数，无需额外说明。
+
+## 用户背景信息
+以下是当前用户的已知信息和长期记忆，你应在回答中优先利用这些信息进行个性化回复：
+{{memory_context}}
+若无相关信息，可礼貌询问或提供通用帮助。
+
+## 回答要求（必须严格遵守）
+1. **来源标注**：回答开头必须明确标注信息来源，格式如下：
+   - 使用知识库时：`【知识库：来源描述】`
+   - 使用联网搜索时：`【联网搜索：来源描述】`
+   - 若同时用到多个来源，按实际使用顺序标注，例如：`【知识库：三国演义】【联网搜索：百度百科】`
+2. **思维链**：如果问题需要深入推理或复杂思考，请将推理过程用 `<think>...</think>` 标签包裹，放在回答最前面（来源标注之前）。
+3. **简洁直接**：回答应重点突出、条理清晰，避免冗长。
+4. **个性化**：结合用户信息进行针对性回复。
+5. **无依据时**：若既无知识库支撑也无联网搜索结果，请如实说明无法回答，并建议用户提供更多信息或尝试其他方式。
+'''
+
     return ChatPromptTemplate.from_messages([
         ("system", system_template),
         MessagesPlaceholder(variable_name="messages")
-    ])
+    ])
\ No newline at end of file
diff --git a/backend/app/backend.py b/backend/app/backend.py
index c5e23e6..69a48ba 100644
--- a/backend/app/backend.py
+++ b/backend/app/backend.py
@@ -9,7 +9,7 @@ warnings.filterwarnings("ignore", category=DeprecationWarning, module="websocket
 warnings.filterwarnings("ignore", category=DeprecationWarning, module="uvicorn.protocols.websockets")
 
 import os
-from ..config import DB_URI, BACKEND_PORT
+from backend.app.config import DB_URI, BACKEND_PORT
 import uuid
 import json
 from contextlib import asynccontextmanager
@@ -22,18 +22,18 @@ from pydantic import BaseModel
 from langgraph.checkpoint.postgres.aio import AsyncPostgresSaver
 from .agent.agent_service import AIAgentService, create_serde
 from .agent.history import ThreadHistoryService
-from ..core.human_review import (
+from backend.app.core.human_review import (
     ReviewManager,
     InMemoryReviewStore,
     ReviewStatus,
     HumanReview
 )
-from ..subgraphs.contact.api_client import ContactAPIClient
-from ..subgraphs.dictionary.api_client import DictionaryAPIClient
-from ..subgraphs.news_analysis.api_client import NewsAPIClient
+from backend.app.subgraphs.contact.api_client import ContactAPIClient
+from backend.app.subgraphs.dictionary.api_client import DictionaryAPIClient
+from backend.app.subgraphs.news_analysis.api_client import NewsAPIClient
 from .db.init_db import init_subgraph_tables
 from .db.models import ContactRepository, DictionaryRepository, NewsRepository
-from ..logger import info, error
+from backend.app.logger import info, error
 
 @asynccontextmanager
 async def lifespan(app: FastAPI):
diff --git a/backend/app/main_graph/main_graph_builder.py b/backend/app/main_graph/main_graph_builder.py
index bde6d0f..7937908 100644
--- a/backend/app/main_graph/main_graph_builder.py
+++ b/backend/app/main_graph/main_graph_builder.py
@@ -21,15 +21,15 @@ from .nodes.fast_paths import (
     fast_tool_node,
 )
 from .nodes.llm_call import create_dynamic_llm_call_node
-from .nodes.rag_nodes import rag_retrieve_node
+from .nodes.rag_nodes import rag_retrieve_node, check_rag_confidence
 from .nodes.retrieve_memory import create_retrieve_memory_node
 from .nodes.memory_trigger import memory_trigger_node, set_mem0_client
 from .nodes.summarize import create_summarize_node
 from .nodes.finalize import finalize_node
-from ..subgraphs.contact import build_contact_subgraph
-from ..subgraphs.dictionary import build_dictionary_subgraph
-from ..subgraphs.news_analysis import build_news_analysis_subgraph
-from ..logger import info
+from backend.app.subgraphs.contact import build_contact_subgraph
+from backend.app.subgraphs.dictionary import build_dictionary_subgraph
+from backend.app.subgraphs.news_analysis import build_news_analysis_subgraph
+from backend.app.logger import info
 
 from .subgraph_wrapper import create_subgraph_nodes
 
@@ -198,8 +198,20 @@ def _add_react_loop_edges(graph: StateGraph, subgraph_nodes: Dict[str, Any]) ->
         }
     )
 
+    # RAG 检索后的置信度判断分支
+    graph.add_conditional_edges(
+        "rag_retrieve",
+        check_rag_confidence,
+        {
+            "high_confidence": "llm_call",      # 高置信度 → 直接生成回答
+            "retry_rag": "rag_retrieve",         # 低置信度 → 再次检索
+            "low_confidence": "web_search",      # 两次RAG后仍低 → 联网搜索
+            "no_rag": "web_search",             # 无结果 → 联网搜索
+        }
+    )
+
     # 循环边（回到 react_reason）
-    loop_back_nodes = ["rag_retrieve", "web_search", "handle_error"] + subgraph_names
+    loop_back_nodes = ["web_search", "handle_error"] + subgraph_names
     for node_name in loop_back_nodes:
         graph.add_edge(node_name, "react_reason")
 
diff --git a/backend/app/main_graph/nodes/__init__.py b/backend/app/main_graph/nodes/__init__.py
index bd00186..0ff79ae 100644
--- a/backend/app/main_graph/nodes/__init__.py
+++ b/backend/app/main_graph/nodes/__init__.py
@@ -8,7 +8,7 @@ from .web_search import web_search_node
 from .error_handling import error_handling_node
 from .routing import init_state_node, route_by_reasoning, should_summarize
 from .llm_call import create_dynamic_llm_call_node
-from .rag_nodes import rag_retrieve_node, rag_re_retrieve_node
+from .rag_nodes import rag_retrieve_node
 
 # 记忆节点
 from .retrieve_memory import create_retrieve_memory_node
diff --git a/backend/app/main_graph/nodes/error_handling.py b/backend/app/main_graph/nodes/error_handling.py
index 646afb0..e077fbd 100644
--- a/backend/app/main_graph/nodes/error_handling.py
+++ b/backend/app/main_graph/nodes/error_handling.py
@@ -3,7 +3,7 @@
 """
 
 from ...main_graph.state import MainGraphState, ErrorSeverity
-from ...logger import info
+from backend.app.logger import info
 
 
 def error_handling_node(state: MainGraphState) -> MainGraphState:
diff --git a/backend/app/main_graph/nodes/fast_paths.py b/backend/app/main_graph/nodes/fast_paths.py
index 52357f5..6dc7fec 100644
--- a/backend/app/main_graph/nodes/fast_paths.py
+++ b/backend/app/main_graph/nodes/fast_paths.py
@@ -7,7 +7,7 @@ from typing import Optional
 from langchain_core.runnables.config import RunnableConfig
 
 from ..state import MainGraphState
-from ...logger import info, debug
+from backend.app.logger import info, debug
 from ...model_services.chat_services import get_small_llm_service, get_chat_service
 from .rag_nodes import rag_retrieve_node
 from ._utils import dispatch_custom_event
@@ -113,10 +113,18 @@ async def fast_rag_node(state: MainGraphState, config: Optional[RunnableConfig]
 
 
 def _has_valid_rag_results(state: MainGraphState) -> bool:
-    """检查 RAG 结果是否有效"""
-    rag_docs = getattr(state, "rag_docs", [])
+    """检查 RAG 结果是否有效（基于置信度）"""
+    from .rag_nodes import RAG_CONFIDENCE_THRESHOLD
     rag_context = getattr(state, "rag_context", "")
-    return (rag_docs and len(rag_docs) > 0) or (rag_context and len(rag_context) > 10)
+    rag_confidence = getattr(state, "rag_confidence", 0.0)
+
+    # 有结果且置信度足够
+    has_content = rag_context and len(rag_context) > 0
+    has_confidence = rag_confidence >= RAG_CONFIDENCE_THRESHOLD
+
+    info(f"[Fast RAG Check] has_content={has_content}, rag_confidence={rag_confidence:.2f}, threshold={RAG_CONFIDENCE_THRESHOLD}")
+
+    return has_content and has_confidence
 
 
 async def _generate_fast_answer(state: MainGraphState, query: str) -> MainGraphState:
diff --git a/backend/app/main_graph/nodes/finalize.py b/backend/app/main_graph/nodes/finalize.py
index 4dc859d..784c340 100644
--- a/backend/app/main_graph/nodes/finalize.py
+++ b/backend/app/main_graph/nodes/finalize.py
@@ -8,7 +8,7 @@ from typing import Any, Dict
 # 本地模块
 from ...main_graph.state import MainGraphState
 from ...utils.logging import log_state_change
-from ...logger import info, warning
+from backend.app.logger import info, warning
 
 from langchain_core.runnables.config import RunnableConfig
 
diff --git a/backend/app/main_graph/nodes/hybrid_router.py b/backend/app/main_graph/nodes/hybrid_router.py
index 729a07c..a18cba9 100644
--- a/backend/app/main_graph/nodes/hybrid_router.py
+++ b/backend/app/main_graph/nodes/hybrid_router.py
@@ -11,7 +11,7 @@ from datetime import datetime
 from langchain_core.runnables.config import RunnableConfig
 
 from ..state import MainGraphState
-from ...logger import info, debug
+from backend.app.logger import info, debug
 from ...model_services.chat_services import get_small_llm_service
 from ._utils import dispatch_custom_event
 
diff --git a/backend/app/main_graph/nodes/llm_call.py b/backend/app/main_graph/nodes/llm_call.py
index fc0bbdb..9ab9fd2 100644
--- a/backend/app/main_graph/nodes/llm_call.py
+++ b/backend/app/main_graph/nodes/llm_call.py
@@ -12,7 +12,7 @@ from langchain_core.messages import AIMessage
 from ...main_graph.state import MainGraphState
 from ...agent.prompts import create_system_prompt
 from ...utils.logging import log_state_change
-from ...logger import debug, info, error
+from backend.app.logger import debug, info, error
 
 
 def create_dynamic_llm_call_node(chat_services: Dict[str, BaseChatModel], tools: list):
@@ -115,24 +115,7 @@ def create_dynamic_llm_call_node(chat_services: Dict[str, BaseChatModel], tools:
             ):
                 chunks.append(chunk)
 
-            info(f"[llm_call] LLM astream 完成，共收到 {len(chunks)} 个 chunks")
-            for i, chunk in enumerate(chunks[:10]):  # 只打印前10个避免日志过多
-                chunk_type = type(chunk).__name__
-                chunk_content = getattr(chunk, 'content', '') if hasattr(chunk, 'content') else str(chunk)
-                # 打印更多属性
-                additional_kwargs = getattr(chunk, 'additional_kwargs', {}) or {}
-                response_metadata = getattr(chunk, 'response_metadata', {}) or {}
-                # 打印所有属性
-                info(f"[llm_call]   chunk[{i}] type={chunk_type}")
-                info(f"[llm_call]   chunk[{i}] content长度={len(chunk_content) if chunk_content else 0}, content={repr(chunk_content[:200] if chunk_content else '')}")
-                info(f"[llm_call]   chunk[{i}] additional_kwargs={additional_kwargs}")
-                info(f"[llm_call]   chunk[{i}] response_metadata keys={list(response_metadata.keys()) if response_metadata else []}")
-                info(f"[llm_call]   chunk[{i}] response_metadata={response_metadata}")
-                # 检查是否有其他可能存储内容的属性
-                if hasattr(chunk, 'tool_call_chunks'):
-                    info(f"[llm_call]   chunk[{i}] tool_call_chunks={chunk.tool_call_chunks}")
-                if hasattr(chunk, 'usage_metadata'):
-                    info(f"[llm_call]   chunk[{i}] usage_metadata={chunk.usage_metadata}")
+            info(f"[llm_call] LLM astream 完成，共收到 {len(chunks)} 个 chunks,info:{chunks}")
 
             # 将所有 chunk 合并成最终的 AIMessage
             if chunks:
diff --git a/backend/app/main_graph/nodes/memory_trigger.py b/backend/app/main_graph/nodes/memory_trigger.py
index 3dd0d73..7d309af 100644
--- a/backend/app/main_graph/nodes/memory_trigger.py
+++ b/backend/app/main_graph/nodes/memory_trigger.py
@@ -2,7 +2,7 @@ from typing import Any, Dict
 from langchain_core.runnables.config import RunnableConfig
 from ...main_graph.state import MainGraphState
 from ...memory.mem0_client import Mem0Client
-from ...logger import info
+from backend.app.logger import info
 
 
 # 全局变量，在 GraphBuilder 中注入
diff --git a/backend/app/main_graph/nodes/rag_nodes.py b/backend/app/main_graph/nodes/rag_nodes.py
index c04b664..d036cac 100644
--- a/backend/app/main_graph/nodes/rag_nodes.py
+++ b/backend/app/main_graph/nodes/rag_nodes.py
@@ -1,6 +1,6 @@
 """
 RAG 检索节点模块
-使用模块级变量管理 RAG 工具
+包含：RAG 检索、置信度判断、重检索等节点
 """
 
 import time
@@ -11,10 +11,15 @@ from langchain_core.runnables.config import RunnableConfig
 
 from ...main_graph.state import MainGraphState, ErrorRecord, ErrorSeverity
 from ...main_graph.utils.retry_utils import RAG_RETRY_CONFIG
-from ...logger import info
+from backend.app.logger import info, debug
+from ...model_services import get_small_llm_service
 from ._utils import dispatch_custom_event, make_react_event
 
 
+# 置信度阈值配置
+RAG_CONFIDENCE_THRESHOLD = 0.6  # 低于此值认为检索不相关
+
+
 def _get_rag_tool() -> Optional[callable]:
     """获取 RAG 工具"""
     from backend.app.main_graph.utils.rag_initializer import get_rag_tool
@@ -36,43 +41,27 @@ async def _rag_retrieve_core(state: MainGraphState, rag_tool: callable) -> MainG
     # 调用 RAG 工具
     rag_context = await rag_tool.ainvoke(retrieval_query)
     info(f"[RAG Core] 获取到 rag_context: {type(rag_context)}, 长度={len(rag_context) if rag_context else 0}")
-    info(f"[RAG Core] ========== RAG 返回的知识内容 ==========")
-    info(f"{rag_context[:500]}..." if len(rag_context) > 500 else rag_context)
-    info(f"[RAG Core] ========================================")
 
+    # 更新状态
     state.rag_context = rag_context
-    state.rag_docs = [{"source": "rag_retrieval", "content": rag_context}]
     state.rag_retrieved = True
-    state.success = True
+    state.rag_attempts = getattr(state, 'rag_attempts', 0) + 1
     state.debug_info["rag_source"] = "tool"
 
-    info(f"[RAG Core] state.rag_docs 长度: {len(state.rag_docs)}")
     return state
 
 
 # ========== RAG 检索节点 ==========
 async def rag_retrieve_node(state: MainGraphState, config: Optional[RunnableConfig] = None) -> MainGraphState:
-    """RAG 检索节点：带超时和重试"""
+    """RAG 检索节点：检索 + 置信度评估"""
     state.current_phase = "rag_retrieving"
     start_time = time.time()
-    last_error = None
 
-    # 获取 RAG 工具
     rag_tool = _get_rag_tool()
-
     if not rag_tool:
-        error_record = ErrorRecord(
-            error_type="RAGRetrievalError",
-            error_message="RAG 工具未初始化",
-            severity=ErrorSeverity.WARNING,
-            source="rag_retrieve_node",
-            timestamp=datetime.now().isoformat(),
-            retry_count=0,
-            max_retries=RAG_RETRY_CONFIG.max_retries,
-        )
-        state.errors.append(error_record)
-        state.current_error = error_record
-        state.current_phase = "error_handling"
+        info("[RAG] RAG 工具未初始化")
+        state.rag_confidence = 0.0
+        state.rag_retrieved = False
         return state
 
     await dispatch_custom_event(
@@ -81,99 +70,184 @@ async def rag_retrieve_node(state: MainGraphState, config: Optional[RunnableConf
         config
     )
 
-    for attempt in range(RAG_RETRY_CONFIG.max_retries + 1):
-        try:
-            result = await _rag_retrieve_core(state, rag_tool)
+    try:
+        state = await _rag_retrieve_core(state, rag_tool)
 
-            info(f"[RAG] 检索成功，上下文长度: {len(result.rag_context)} 字符")
+        # 评估置信度
+        confidence = await _evaluate_rag_confidence(state)
+        state.rag_confidence = confidence
 
-            state.debug_info["rag_retrieval"] = {
-                "attempt": attempt + 1,
-                "success": True,
-                "time": time.time() - start_time
-            }
+        info(f"[RAG] 检索完成，置信度={confidence:.2f}，RAG尝试次数={state.rag_attempts}")
 
-            state.reasoning_history.append({
-                "step": state.reasoning_step,
-                "action": "RETRIEVE_RAG",
-                "confidence": 1.0,
-                "reasoning": "RAG 检索完成",
-                "timestamp": datetime.now().isoformat()
-            })
+        state.reasoning_history.append({
+            "step": state.reasoning_step,
+            "action": "RETRIEVE_RAG",
+            "confidence": confidence,
+            "reasoning": f"RAG 检索完成，置信度={confidence:.2f}",
+            "timestamp": datetime.now().isoformat()
+        })
 
-            doc_count = len(result.rag_docs) if result.rag_docs else 0
-            await dispatch_custom_event(
-                "react_reasoning",
-                make_react_event(state.reasoning_step, "rag_retrieve_complete", 1.0,
-                               f"RAG 检索完成，找到 {doc_count} 条相关文档"),
-                config
-            )
+        await dispatch_custom_event(
+            "react_reasoning",
+            make_react_event(state.reasoning_step, "rag_retrieve_complete", confidence,
+                           f"RAG 检索完成，置信度={confidence:.2f}"),
+            config
+        )
 
-            return result
-
-        except Exception as e:
-            last_error = e
-
-            if attempt >= RAG_RETRY_CONFIG.max_retries:
-                break
-
-            await dispatch_custom_event(
-                "react_reasoning",
-                make_react_event(state.reasoning_step, "rag_retrieve_retry", 1.0,
-                               f"RAG 检索失败，第 {attempt + 1} 次重试..."),
-                config
-            )
-
-            delay = RAG_RETRY_CONFIG.base_delay * (2 ** attempt)
-            await asyncio.sleep(min(delay, RAG_RETRY_CONFIG.max_delay))
-
-    # 失败记录
-    state.reasoning_history.append({
-        "step": state.reasoning_step,
-        "action": "RETRIEVE_RAG",
-        "confidence": 0.0,
-        "reasoning": f"RAG 检索失败: {str(last_error) if last_error else '超时'}",
-        "timestamp": datetime.now().isoformat()
-    })
-
-    error_record = ErrorRecord(
-        error_type="RAGRetrievalError",
-        error_message=str(last_error) if last_error else "RAG 检索超时",
-        severity=ErrorSeverity.WARNING,
-        source="rag_retrieve_node",
-        timestamp=datetime.now().isoformat(),
-        retry_count=RAG_RETRY_CONFIG.max_retries,
-        max_retries=RAG_RETRY_CONFIG.max_retries,
-    )
-
-    state.errors.append(error_record)
-    state.current_error = error_record
-    state.current_phase = "error_handling"
-
-    await dispatch_custom_event(
-        "react_reasoning",
-        make_react_event(state.reasoning_step, "rag_retrieve_error", 1.0,
-                       f"RAG 检索失败: {str(last_error)}"),
-        config
-    )
+    except Exception as e:
+        info(f"[RAG] 检索失败: {e}")
+        state.rag_confidence = 0.0
+        state.rag_retrieved = False
 
     return state
 
 
-async def rag_re_retrieve_node(state: MainGraphState, config: Optional[RunnableConfig] = None) -> MainGraphState:
-    """重新检索节点"""
-    state.current_phase = "rag_re_retrieving"
+async def _evaluate_rag_confidence(state: MainGraphState) -> float:
+    """评估 RAG 检索结果置信度（综合向量相似度 + 重排分数 + 小模型判断）"""
+    query = state.user_query or ""
+    rag_context = state.rag_context or ""
 
-    state.debug_info["rag_re_retrieve"] = {
-        "original_retrieved": state.rag_retrieved,
-        "original_docs_count": len(state.rag_docs)
-    }
+    if not rag_context:
+        return 0.0
 
-    return await rag_retrieve_node(state, config)
+    # 方式1: 向量相似度（从 rag_docs 中获取）
+    embedding_score = _get_embedding_similarity(state, query)
+    info(f"[RAG Confidence] 向量相似度={embedding_score:.3f}")
+
+    # 方式2: 重排序分数（从 rag_docs 中获取）
+    rerank_score = _get_rerank_score(state)
+    info(f"[RAG Confidence] 重排分数={rerank_score:.3f}")
+
+    # 方式3: 小模型判断
+    llm_score = await _get_llm_score(state)
+    info(f"[RAG Confidence] LLM评估={llm_score:.3f}")
+
+    # 综合得分（加权平均）
+    # 向量相似度权重 0.3，重排权重 0.3，LLM 权重 0.4
+    final_score = embedding_score * 0.3 + rerank_score * 0.3 + llm_score * 0.4
+    info(f"[RAG Confidence] 综合置信度={final_score:.3f} (embedding={embedding_score:.3f}*0.3 + rerank={rerank_score:.3f}*0.3 + llm={llm_score:.3f}*0.4)")
+
+    return final_score
+
+
+def _get_embedding_similarity(state: MainGraphState) -> float:
+    """从 rag_docs 中获取向量相似度分数"""
+    rag_docs = getattr(state, "rag_docs", [])
+
+    # 如果有多个文档，取最高分
+    scores = []
+    for doc in rag_docs:
+        if isinstance(doc, dict):
+            score = doc.get("score", 0.0)
+            # 向量相似度通常在 0-1 之间，RRF 分数可能更高
+            # 归一化到 0-1
+            if score > 1.0:
+                score = min(score / 10.0, 1.0)  # 假设 max 约 10
+            scores.append(score)
+        elif hasattr(doc, "metadata"):
+            score = doc.metadata.get("score", 0.0)
+            if score > 1.0:
+                score = min(score / 10.0, 1.0)
+            scores.append(score)
+
+    if scores:
+        # 取平均或最高分
+        return max(scores)  # 使用最高分更准确
+    return 0.0
+
+
+def _get_rerank_score(state: MainGraphState) -> float:
+    """从 rag_docs 中获取重排序分数"""
+    rag_docs = getattr(state, "rag_docs", [])
+
+    # 重排分数通常在 0-1 之间
+    scores = []
+    for doc in rag_docs:
+        if isinstance(doc, dict):
+            score = doc.get("rerank_score", 0.0)
+        elif hasattr(doc, "metadata"):
+            score = doc.metadata.get("rerank_score", 0.0)
+        else:
+            score = 0.0
+
+        if score > 0:
+            scores.append(score)
+
+    if scores:
+        return max(scores)  # 使用最高分
+    return 0.0
+
+
+async def _get_llm_score(state: MainGraphState) -> float:
+    """使用小模型评估检索结果相关性"""
+    query = state.user_query or ""
+    rag_context = state.rag_context or ""
+
+    try:
+        llm = get_small_llm_service()
+        prompt = f"""评估以下检索结果与用户问题的相关性，返回 0.0-1.0 的分数：
+- 1.0 = 完全相关，能直接回答问题
+- 0.5 = 部分相关，有一定参考价值
+- 0.0 = 完全不相关，无法回答问题
+
+用户问题：{query}
+
+检索结果：{rag_context[:1500]}
+
+只返回一个数字："""
+
+        response = await llm.ainvoke(prompt)
+        content = response.content.strip()
+
+        import re
+        match = re.search(r'(\d+\.?\d*)', content)
+        if match:
+            score = float(match.group(1))
+            return max(0.0, min(1.0, score))
+
+    except Exception as e:
+        info(f"[RAG Confidence] LLM评估失败: {e}")
+
+    return 0.5  # 默认中等置信度
+
+
+# ========== 置信度判断节点 ==========
+def check_rag_confidence(state: MainGraphState) -> str:
+    """
+    根据 RAG 置信度判断下一步
+
+    Returns:
+        "high_confidence" - 高置信度(>=0.6)，可直接生成回答
+        "low_confidence" - 低置信度(<0.6)，需要联网搜索
+        "no_rag" - 无检索结果，需要联网搜索
+    """
+    rag_attempts = getattr(state, 'rag_attempts', 0)
+    rag_confidence = getattr(state, 'rag_confidence', 0.0)
+
+    info(f"[Confidence Check] rag_attempts={rag_attempts}, rag_confidence={rag_confidence:.2f}")
+
+    # 情况1: 没有检索结果
+    if not getattr(state, 'rag_retrieved', False) or not state.rag_context:
+        info("[Confidence Check] 无检索结果，走联网")
+        return "no_rag"
+
+    # 情况2: 置信度低于阈值
+    if rag_confidence < RAG_CONFIDENCE_THRESHOLD:
+        if rag_attempts >= 2:
+            info(f"[Confidence Check] 置信度={rag_confidence:.2f}<{RAG_CONFIDENCE_THRESHOLD}，且RAG尝试{rag_attempts}次，走联网")
+            return "low_confidence"
+        else:
+            info(f"[Confidence Check] 置信度={rag_confidence:.2f}<{RAG_CONFIDENCE_THRESHOLD}，可再尝试RAG一次")
+            return "retry_rag"
+
+    # 情况3: 高置信度
+    info(f"[Confidence Check] 高置信度={rag_confidence:.2f}>={RAG_CONFIDENCE_THRESHOLD}，直接生成回答")
+    return "high_confidence"
 
 
 # ========== 导出 ==========
 __all__ = [
     "rag_retrieve_node",
-    "rag_re_retrieve_node",
+    "check_rag_confidence",
+    "RAG_CONFIDENCE_THRESHOLD",
 ]
diff --git a/backend/app/main_graph/nodes/reasoning.py b/backend/app/main_graph/nodes/reasoning.py
index 09ef0a3..b8c81e1 100644
--- a/backend/app/main_graph/nodes/reasoning.py
+++ b/backend/app/main_graph/nodes/reasoning.py
@@ -7,9 +7,9 @@ from typing import Optional
 from datetime import datetime
 from langchain_core.runnables.config import RunnableConfig
 
-from ...core.intent import react_reason_async, ReasoningResult
+from backend.app.core.intent import react_reason_async, ReasoningResult
 from ...main_graph.state import MainGraphState
-from ...logger import info
+from backend.app.logger import info
 from ._utils import dispatch_custom_event, make_react_event
 
 
diff --git a/backend/app/main_graph/nodes/retrieve_memory.py b/backend/app/main_graph/nodes/retrieve_memory.py
index 1a48855..3837796 100644
--- a/backend/app/main_graph/nodes/retrieve_memory.py
+++ b/backend/app/main_graph/nodes/retrieve_memory.py
@@ -9,7 +9,7 @@ from typing import Any, Dict
 from ...main_graph.state import MainGraphState
 from ...memory.mem0_client import Mem0Client
 from ...utils.logging import log_state_change
-from ...logger import debug
+from backend.app.logger import debug
 
 
 def create_retrieve_memory_node(mem0_client: Mem0Client):
diff --git a/backend/app/main_graph/nodes/routing.py b/backend/app/main_graph/nodes/routing.py
index d9b62dd..36d18b4 100644
--- a/backend/app/main_graph/nodes/routing.py
+++ b/backend/app/main_graph/nodes/routing.py
@@ -10,9 +10,9 @@
 
 from datetime import datetime
 
-from ...core.intent import get_route_by_reasoning, ReasoningAction
+from backend.app.core.intent import get_route_by_reasoning, ReasoningAction
 from ...main_graph.state import MainGraphState
-from ...logger import info
+from backend.app.logger import info
 
 
 # ========== 初始化状态节点 ==========
@@ -97,6 +97,12 @@ def route_by_reasoning(state: MainGraphState) -> str:
     }
     target = route_mapping.get(route, "llm_call")
 
+    # ========== RAG 次数硬限制 ==========
+    rag_attempts = getattr(state, 'rag_attempts', 0)
+    if target == "rag_retrieve" and rag_attempts >= 2:
+        info(f"[条件路由] RAG已尝试{rag_attempts}次，强制走联网搜索")
+        target = "web_search"
+
     # ========== 循环防护检测 ==========
     # 1. 路由模式检测（A→B→A→B 交替）
     if len(previous_actions) >= 4:
diff --git a/backend/app/main_graph/nodes/summarize.py b/backend/app/main_graph/nodes/summarize.py
index 1969d10..3836de7 100644
--- a/backend/app/main_graph/nodes/summarize.py
+++ b/backend/app/main_graph/nodes/summarize.py
@@ -9,7 +9,7 @@ from typing import Any, Dict
 from ...main_graph.state import MainGraphState
 from ...memory.mem0_client import Mem0Client
 from ...utils.logging import log_state_change
-from ...logger import debug, info, error, warning
+from backend.app.logger import debug, info, error, warning
 
 
 def create_summarize_node(mem0_client: Mem0Client):
diff --git a/backend/app/main_graph/nodes/tool_call.py b/backend/app/main_graph/nodes/tool_call.py
index 315f119..b990615 100644
--- a/backend/app/main_graph/nodes/tool_call.py
+++ b/backend/app/main_graph/nodes/tool_call.py
@@ -11,7 +11,7 @@ from ...main_graph.config import get_stream_writer
 # 本地模块
 from ...main_graph.state import MainGraphState
 from ...utils.logging import log_state_change
-from ...logger import debug, info
+from backend.app.logger import debug, info
 
 def create_tool_call_node(tools_by_name: Dict[str, Any]):
     """
diff --git a/backend/app/main_graph/nodes/web_search.py b/backend/app/main_graph/nodes/web_search.py
index f9aa62e..d02d9da 100644
--- a/backend/app/main_graph/nodes/web_search.py
+++ b/backend/app/main_graph/nodes/web_search.py
@@ -7,7 +7,7 @@ from datetime import datetime
 from langchain_core.runnables.config import RunnableConfig
 
 from ...main_graph.state import MainGraphState, ErrorRecord, ErrorSeverity
-from ...logger import info
+from backend.app.logger import info
 
 
 async def web_search_node(state: MainGraphState, config: Optional[RunnableConfig] = None) -> MainGraphState:
diff --git a/backend/app/main_graph/state.py b/backend/app/main_graph/state.py
index 92267df..145cb14 100644
--- a/backend/app/main_graph/state.py
+++ b/backend/app/main_graph/state.py
@@ -75,6 +75,8 @@ class MainGraphState:
     rag_context: str = ""
     rag_retrieved: bool = False
     rag_docs: List[Dict[str, Any]] = field(default_factory=list)
+    rag_confidence: float = 0.0  # RAG 检索置信度 (0.0-1.0)
+    rag_attempts: int = 0  # RAG 检索次数统计
     
     # ========== 联网搜索相关字段 ==========
     web_search_results: List[str] = field(default_factory=list)
diff --git a/backend/app/main_graph/subgraph_wrapper.py b/backend/app/main_graph/subgraph_wrapper.py
index f01cec1..91c08f5 100644
--- a/backend/app/main_graph/subgraph_wrapper.py
+++ b/backend/app/main_graph/subgraph_wrapper.py
@@ -8,7 +8,7 @@ from datetime import datetime
 from langchain_core.runnables.config import RunnableConfig
 
 from .state import MainGraphState, ErrorRecord, ErrorSeverity
-from ..logger import info
+from backend.app.logger import info
 
 
 def wrap_subgraph_for_error_handling(subgraph, name: str):
diff --git a/backend/app/main_graph/utils/rag_initializer.py b/backend/app/main_graph/utils/rag_initializer.py
index 62c8d7b..dbd2233 100644
--- a/backend/app/main_graph/utils/rag_initializer.py
+++ b/backend/app/main_graph/utils/rag_initializer.py
@@ -2,7 +2,7 @@
 from ...rag.tools import create_rag_tool
 from ...rag.retriever import create_parent_hybrid_retriever
 from ...model_services import get_embedding_service
-from ...logger import info, warning
+from backend.app.logger import info, warning
 import sys
 
 # 全局 RAG 工具
diff --git a/backend/app/memory/mem0_client.py b/backend/app/memory/mem0_client.py
index 948be98..c9960e7 100644
--- a/backend/app/memory/mem0_client.py
+++ b/backend/app/memory/mem0_client.py
@@ -9,7 +9,7 @@ from typing import Optional, List
 
 from mem0 import AsyncMemory
 
-from ..config import (
+from backend.app.config import (
     LLM_API_KEY,
     ZHIPUAI_API_KEY,
     VLLM_BASE_URL,
@@ -21,7 +21,7 @@ from ..config import (
     ZHIPU_EMBEDDING_MODEL,
     ZHIPU_API_BASE,
 )
-from ..logger import info, warning, error
+from backend.app.logger import info, warning, error
 from ..model_services import get_embedding_service
 from ..model_services.chat_services import get_chat_service
 
diff --git a/backend/app/model_services/chat_services.py b/backend/app/model_services/chat_services.py
index 4843ce8..349712f 100644
--- a/backend/app/model_services/chat_services.py
+++ b/backend/app/model_services/chat_services.py
@@ -23,7 +23,7 @@ from .base import (
     FallbackServiceChain,
     SingletonServiceManager
 )
-from ..config import (
+from backend.app.config import (
     VLLM_BASE_URL,
     LLM_API_KEY,
     ZHIPUAI_API_KEY,
@@ -203,7 +203,7 @@ class LocalSmallModelProvider(BaseServiceProvider[BaseChatModel]):
     """
     
     def __init__(self, model: str = None):
-        from ..config import SMALL_LOCAL_MODEL_NAME, SMALL_VLLM_BASE_URL, SMALL_LLM_API_KEY
+        from backend.app.config import SMALL_LOCAL_MODEL_NAME, SMALL_VLLM_BASE_URL, SMALL_LLM_API_KEY
         super().__init__("local_small")
         self._model = model or SMALL_LOCAL_MODEL_NAME
         self._base_url = SMALL_VLLM_BASE_URL
@@ -242,7 +242,7 @@ class DeepSeekSmallModelProvider(BaseServiceProvider[BaseChatModel]):
     """
     
     def __init__(self, model: str = None):
-        from ..config import SMALL_DEEPSEEK_MODEL, SMALL_DEEPSEEK_API_KEY, SMALL_DEEPSEEK_API_BASE
+        from backend.app.config import SMALL_DEEPSEEK_MODEL, SMALL_DEEPSEEK_API_KEY, SMALL_DEEPSEEK_API_BASE
         super().__init__("deepseek_small")
         self._model = model or SMALL_DEEPSEEK_MODEL
         self._api_key = SMALL_DEEPSEEK_API_KEY
diff --git a/backend/app/model_services/embedding_services.py b/backend/app/model_services/embedding_services.py
index f371571..d8541b8 100644
--- a/backend/app/model_services/embedding_services.py
+++ b/backend/app/model_services/embedding_services.py
@@ -21,7 +21,7 @@ from .base import (
     FallbackServiceChain,
     SingletonServiceManager
 )
-from ..config import (
+from backend.app.config import (
     LLAMACPP_EMBEDDING_URL,
     LLAMACPP_API_KEY,
     ZHIPUAI_API_KEY,
diff --git a/backend/app/model_services/rerank_services.py b/backend/app/model_services/rerank_services.py
index 475995b..f170698 100644
--- a/backend/app/model_services/rerank_services.py
+++ b/backend/app/model_services/rerank_services.py
@@ -27,7 +27,7 @@ from .base import (
     FallbackServiceChain,
     SingletonServiceManager
 )
-from ..config import (
+from backend.app.config import (
     LLAMACPP_RERANKER_URL,
     LLAMACPP_API_KEY,
     ZHIPUAI_API_KEY,
diff --git a/backend/app/rag/pipeline.py b/backend/app/rag/pipeline.py
index 8fd67d2..0d15fea 100644
--- a/backend/app/rag/pipeline.py
+++ b/backend/app/rag/pipeline.py
@@ -81,11 +81,17 @@ class RAGPipeline:
         return await self.retriever.ainvoke(query)
 
     async def _get_parents(self, child_docs: List[Document]) -> List[Document]:
-        parent_map = {}
+        # 收集 parent_id 和对应的分数
+        parent_map = {}  # parent_id -> (embedding_score, rerank_score)
+
         for doc in child_docs:
             pid = doc.metadata.get("parent_id")
             if pid and pid not in parent_map:
-                parent_map[pid] = doc.metadata.get("score", 0.0)
+                # embedding 分数
+                embedding_score = doc.metadata.get("score", 0.0)
+                # rerank 分数（如果有的话）
+                rerank_score = doc.metadata.get("rerank_score", 0.0)
+                parent_map[pid] = (embedding_score, rerank_score)
 
         if not parent_map:
             logger.warning("[Pipeline] 未找到 parent_id，返回子文档")
@@ -94,10 +100,19 @@ class RAGPipeline:
         try:
             from backend.rag_core import create_docstore
             docstore, _ = create_docstore()
-            # 同步获取（异步版本不存在）
             parent_docs = docstore.mget(list(parent_map.keys()))
-            parent_map2 = {d.metadata.get("id"): d for d in parent_docs if d}
-            result = [(parent_map2[pid], score) for pid, score in parent_map.items() if pid in parent_map2]
+
+            # 构建结果，保持分数信息
+            result = []
+            for doc in parent_docs:
+                if doc:
+                    pid = doc.metadata.get("id")
+                    scores = parent_map.get(pid, (0.0, 0.0))
+                    # 将分数添加到 metadata 中
+                    doc.metadata["embedding_score"] = scores[0]
+                    doc.metadata["rerank_score"] = scores[1]
+                    result.append((doc, scores[0] + scores[1] * 2))  # 综合分数，rerank 权重更高
+
             result.sort(key=lambda x: x[1], reverse=True)
             docs = [d for d, _ in result]
             logger.info(f"[Pipeline] 获取到 {len(docs)} 个父文档")
diff --git a/backend/app/rag/rerank.py b/backend/app/rag/rerank.py
index d63d303..dd0213c 100644
--- a/backend/app/rag/rerank.py
+++ b/backend/app/rag/rerank.py
@@ -49,44 +49,38 @@ class DocumentReranker:
             top_n: 返回前 N 个结果
 
         Returns:
-            List[Document]: 排序后的文档列表
+            List[Document]: 排序后的文档列表，每个文档的 metadata 中包含 rerank_score
         """
         if not documents:
             return []
 
         try:
-            # 1. 从 Document 提取内容（业务逻辑）
+            # 1. 从 Document 提取内容
             doc_contents = [doc.page_content for doc in documents]
-            logger.info(f"[Rerank] 收到 {len(documents)} 个文档待重排, query={query[:50]}")
-            total_chars = sum(len(c) for c in doc_contents)
-            logger.info(f"[Rerank] 各文档长度: {[len(c) for c in doc_contents]}, 总字符数: {total_chars}")
-            # 粗略估算 tokens (中文约 0.75 tokens/字符)
-            estimated_tokens = int(total_chars * 0.75)
-            logger.info(f"[Rerank] 估算总 tokens: ~{estimated_tokens} (假设中文)")
+            logger.info(f"[Rerank] 收到 {len(documents)} 个文档待重排")
 
-            # 2. 调用纯服务层计算得分
-            logger.info(f"[Rerank] 正在调用 rerank service: {type(self._rerank_service).__name__}")
+            # 2. 调用重排服务计算得分
             scores = self._rerank_service.compute_scores(query, doc_contents)
-            logger.info(f"[Rerank] 获取到 {len(scores)} 个得分: {scores}")
+            logger.info(f"[Rerank] 获取到 {len(scores)} 个得分")
 
-            # 3. 根据得分排序（业务逻辑）
+            # 3. 构建 (文档, 分数) 对并排序
             doc_score_pairs = list(zip(documents, scores))
             doc_score_pairs_sorted = sorted(doc_score_pairs, key=lambda x: x[1], reverse=True)
 
-            logger.info(f"[Rerank] 排序后的结果:")
-            for i, (doc, score) in enumerate(doc_score_pairs_sorted):
-                logger.info(f"  [{i}] score={score:.4f}, content={doc.page_content[:80]}...")
-
-            # 4. 取 top_n
-            top_docs = [pair[0] for pair in doc_score_pairs_sorted[:top_n]]
+            # 4. 取 top_n，并添加 rerank_score 到 metadata
+            top_docs = []
+            for doc, score in doc_score_pairs_sorted[:top_n]:
+                # 创建新文档，添加 rerank_score
+                new_doc = Document(
+                    page_content=doc.page_content,
+                    metadata={**doc.metadata, "rerank_score": score}
+                )
+                top_docs.append(new_doc)
 
             return top_docs
 
         except Exception as e:
-            logger.warning(f"重排过程出错，返回原始前 {top_n} 个结果: {e}")
-            logger.warning(f"[Rerank] 异常详情: {type(e).__name__}: {e}")
-            import traceback
-            logger.warning(f"[Rerank] 堆栈: {traceback.format_exc()}")
+            logger.warning(f"[Rerank] 重排失败，返回原始结果: {e}")
             return documents[:top_n]
 
 
diff --git a/backend/app/rag/retriever.py b/backend/app/rag/retriever.py
index 5f70b4c..b50a903 100644
--- a/backend/app/rag/retriever.py
+++ b/backend/app/rag/retriever.py
@@ -22,7 +22,7 @@ from pydantic import Field, PrivateAttr
 from backend.rag_core import QdrantHybridStore, get_sparse_embedder, create_docstore
 from backend.rag_core.client import create_async_qdrant_client
 from ..model_services import get_embedding_service
-from ..logger import info, warning, debug
+from backend.app.logger import info, warning, debug
 
 
 # 模块级常量
diff --git a/backend/app/subgraphs/contact/nodes.py b/backend/app/subgraphs/contact/nodes.py
index 19c7692..fcd0c29 100644
--- a/backend/app/subgraphs/contact/nodes.py
+++ b/backend/app/subgraphs/contact/nodes.py
@@ -8,7 +8,7 @@ from typing import Dict, Any
 from datetime import datetime
 
 # 公共工具
-from ...core import MarkdownFormatter
+from backend.app.core import MarkdownFormatter
 
 from .state import ContactState
 from .api_client import ContactAPIClient
diff --git a/backend/app/subgraphs/dictionary/nodes.py b/backend/app/subgraphs/dictionary/nodes.py
index 3b094a6..b28756c 100644
--- a/backend/app/subgraphs/dictionary/nodes.py
+++ b/backend/app/subgraphs/dictionary/nodes.py
@@ -8,7 +8,7 @@ from datetime import datetime
 import random
 
 # 公共工具
-from ...core import (
+from backend.app.core import (
     MarkdownFormatter
 )
 
diff --git a/backend/app/subgraphs/news_analysis/nodes.py b/backend/app/subgraphs/news_analysis/nodes.py
index 99d6d17..44a9b48 100644
--- a/backend/app/subgraphs/news_analysis/nodes.py
+++ b/backend/app/subgraphs/news_analysis/nodes.py
@@ -7,7 +7,7 @@ from typing import Dict, Any
 from datetime import datetime
 
 # 公共工具
-from ...core import MarkdownFormatter
+from backend.app.core import MarkdownFormatter
 
 from .state import (
     NewsAnalysisState,
diff --git a/backend/app/utils/logging.py b/backend/app/utils/logging.py
index 9cd48b8..4ce7bc4 100644
--- a/backend/app/utils/logging.py
+++ b/backend/app/utils/logging.py
@@ -3,8 +3,8 @@ LangGraph 节点日志工具模块
 提供状态流转追踪和 LLM 输入输出打印功能
 """
 
-from ..config import ENABLE_GRAPH_TRACE
-from ..logger import debug, info
+from backend.app.config import ENABLE_GRAPH_TRACE
+from backend.app.logger import debug, info
 from ..main_graph.state import MainGraphState
 
 
diff --git a/tools/start.py b/tools/start.py
index 1e3cc43..db56a5a 100755
--- a/tools/start.py
+++ b/tools/start.py
@@ -69,7 +69,7 @@ def cleanup(signum, frame):
     for i, proc in enumerate(processes):
         if proc.poll() is None:  # 进程还在运行
             proc.terminate()
-            proc.wait(timeout=5)
+            proc.wait(timeout=1)
             print(f"✓ 服务 {i+1} 已停止")
     sys.exit(0)