diff --git a/backend/app/agent/__init__.py b/backend/app/agent/__init__.py
index a5e2eba..3877d7f 100644
--- a/backend/app/agent/__init__.py
+++ b/backend/app/agent/__init__.py
@@ -2,6 +2,6 @@
 Agent 子模块
 """
 
-from .service import AIAgentService
+from .agent_service import AIAgentService
 
 __all__ = ["AIAgentService"]
diff --git a/backend/app/main_graph/nodes/rag_nodes.py b/backend/app/main_graph/nodes/rag_nodes.py
index deeb949..06c0421 100644
--- a/backend/app/main_graph/nodes/rag_nodes.py
+++ b/backend/app/main_graph/nodes/rag_nodes.py
@@ -12,7 +12,7 @@ from typing import Dict, Any, Optional
 from datetime import datetime
 
 from app.main_graph.state import MainGraphState, ErrorRecord, ErrorSeverity
-from .retry_utils import (
+from app.main_graph.utils.retry_utils import (
     RetryConfig,
     RAG_RETRY_CONFIG,
     create_retry_wrapper_for_node
diff --git a/backend/app/main_graph/nodes/react_nodes.py b/backend/app/main_graph/nodes/react_nodes.py
index a55c4a8..196546b 100644
--- a/backend/app/main_graph/nodes/react_nodes.py
+++ b/backend/app/main_graph/nodes/react_nodes.py
@@ -23,7 +23,7 @@ from app.core.intent import (
 )
 from app.core.state_base import StateUtils
 from app.main_graph.state import MainGraphState, ErrorRecord, ErrorSeverity
-from .retry_utils import (
+from app.main_graph.utils.retry_utils import (
     RetryConfig,
     SUBGRAPH_RETRY_CONFIG
 )
diff --git a/backend/app/main_graph/utils/main_graph_builder.py b/backend/app/main_graph/utils/main_graph_builder.py
index 9df544f..081d316 100644
--- a/backend/app/main_graph/utils/main_graph_builder.py
+++ b/backend/app/main_graph/utils/main_graph_builder.py
@@ -7,7 +7,7 @@ from app.main_graph.graph import StateGraph, START, END
 from typing import Dict, Any
 
 from app.main_graph.state import MainGraphState, CurrentAction
-from .react_nodes import (
+from app.main_graph.nodes.react_nodes import (
     init_state_node,
     react_reason_node,
     web_search_node,  # ⭐ 新增
@@ -15,7 +15,7 @@ from .react_nodes import (
     final_response_node,
     route_by_reasoning
 )
-from .rag_nodes import rag_retrieve_node
+from app.main_graph.nodes.rag_nodes import rag_retrieve_node
 from app.subgraphs.contact import build_contact_subgraph
 from app.subgraphs.dictionary import build_dictionary_subgraph
 from app.subgraphs.news_analysis import build_news_analysis_subgraph