diff --git a/backend/app/agent_subgraphs/contact/__init__.py b/backend/app/agent_subgraphs/contact/__init__.py
index 4cb5e87..cb55dd4 100644
--- a/backend/app/agent_subgraphs/contact/__init__.py
+++ b/backend/app/agent_subgraphs/contact/__init__.py
@@ -1,6 +1,6 @@
 """
-通讯录子图
-Contact Subgraph Module
+通讯录子图 - 完善版
+Contact Subgraph Module - Complete
 """
 
 from .state import (
@@ -22,6 +22,7 @@ from .nodes import (
     format_result,
     should_continue
 )
+from .api_client import contact_api, ContactAPIClient
 
 __all__ = [
     # State
@@ -43,5 +44,9 @@ __all__ = [
     "send_email",
     "sniff_contacts",
     "format_result",
-    "should_continue"
+    "should_continue",
+    
+    # API
+    "contact_api",
+    "ContactAPIClient"
 ]
diff --git a/backend/app/agent_subgraphs/contact/api_client.py b/backend/app/agent_subgraphs/contact/api_client.py
new file mode 100644
index 0000000..cce155f
--- /dev/null
+++ b/backend/app/agent_subgraphs/contact/api_client.py
@@ -0,0 +1,197 @@
+"""
+通讯录子图API调用工具
+Contact Subgraph API Client
+"""
+
+from typing import Dict, Any, Optional, List
+from datetime import datetime
+from dataclasses import dataclass
+
+from .state import Contact, Email
+
+
+# 模拟数据库
+MOCK_CONTACTS_DB = {}
+MOCK_EMAILS_DB = []
+
+
+@dataclass
+class ContactAPIClient:
+    """
+    通讯录API客户端 - 可扩展支持多种后端
+    """
+    
+    def list_contacts_mock(self, user_id: str = "default") -> List[Contact]:
+        """
+        模拟查询联系人列表
+        """
+        if user_id not in MOCK_CONTACTS_DB:
+            # 初始化一些示例数据
+            MOCK_CONTACTS_DB[user_id] = [
+                Contact(
+                    id="1",
+                    name="张三",
+                    phone="13800138000",
+                    email="zhangsan@example.com",
+                    company="科技公司",
+                    position="工程师",
+                    created_at=datetime.now().isoformat()
+                ),
+                Contact(
+                    id="2",
+                    name="李四",
+                    phone="13900139000",
+                    email="lisi@example.com",
+                    company="贸易公司",
+                    position="经理",
+                    created_at=datetime.now().isoformat()
+                ),
+                Contact(
+                    id="3",
+                    name="王五",
+                    phone="13700137000",
+                    email="wangwu@example.com",
+                    company="咨询公司",
+                    position="顾问",
+                    created_at=datetime.now().isoformat()
+                )
+            ]
+        
+        return MOCK_CONTACTS_DB[user_id]
+    
+    def extract_contact_info_mock(self, query: str) -> Optional[Dict[str, Any]]:
+        """
+        模拟从查询中提取联系人信息
+        """
+        # 简化的提取逻辑
+        import re
+        
+        # 提取邮箱
+        email_match = re.search(r'[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,}', query)
+        # 提取手机号
+        phone_match = re.search(r'1[3-9]\d{9}', query)
+        # 提取姓名（简单匹配）
+        # 先看是否有"添加"等关键词
+        if any(keyword in query for keyword in ["添加", "add"]):
+            # 尝试提取姓名
+            name = "未知"
+            # 简单的逻辑：去掉关键词、去掉邮箱和电话后剩下的
+            clean_query = query
+            if email_match:
+                clean_query = clean_query.replace(email_match.group(), "")
+            if phone_match:
+                clean_query = clean_query.replace(phone_match.group(), "")
+            clean_query = clean_query.replace("添加", "").replace("add", "").replace("联系人", "").strip()
+            if clean_query:
+                name = clean_query
+            
+            return {
+                "name": name,
+                "phone": phone_match.group() if phone_match else "",
+                "email": email_match.group() if email_match else "",
+                "created_at": datetime.now().isoformat()
+            }
+        
+        return None
+    
+    def save_contact_mock(self, user_id: str, contact: Contact) -> bool:
+        """
+        模拟保存联系人
+        """
+        if user_id not in MOCK_CONTACTS_DB:
+            MOCK_CONTACTS_DB[user_id] = []
+        
+        if not contact.id:
+            contact.id = str(len(MOCK_CONTACTS_DB[user_id]) + 1)
+        
+        MOCK_CONTACTS_DB[user_id].append(contact)
+        return True
+    
+    def list_emails_mock(self) -> List[Email]:
+        """
+        模拟查询邮件列表
+        """
+        global MOCK_EMAILS_DB
+        
+        if not MOCK_EMAILS_DB:
+            # 初始化一些示例邮件
+            MOCK_EMAILS_DB = [
+                Email(
+                    id="1",
+                    subject="会议邀请：AI技术分享",
+                    sender="admin@example.com",
+                    recipients=["user@example.com"],
+                    date=datetime.now().isoformat(),
+                    body="你好，下周一将举办AI技术分享会，欢迎参加。"
+                ),
+                Email(
+                    id="2",
+                    subject="项目进度更新",
+                    sender="manager@example.com",
+                    recipients=["user@example.com"],
+                    date=datetime.now().isoformat(),
+                    body="项目进度良好，继续保持。"
+                )
+            ]
+        
+        return MOCK_EMAILS_DB
+    
+    def generate_email_draft_mock(self, query: str) -> Dict[str, str]:
+        """
+        模拟生成邮件草稿
+        """
+        # 简单的模板生成
+        return {
+            "subject": f"Re: {query}",
+            "recipient": "recipient@example.com",
+            "body": "你好，\n\n这是一封自动生成的邮件草稿。\n\n此致，\n你的助手"
+        }
+    
+    def send_email_mock(self, recipient: str, subject: str, body: str) -> Dict[str, Any]:
+        """
+        模拟发送邮件
+        """
+        # 记录到模拟数据库
+        MOCK_EMAILS_DB.append(
+            Email(
+                id=str(len(MOCK_EMAILS_DB) + 1),
+                subject=subject,
+                sender="me@example.com",
+                recipients=[recipient],
+                date=datetime.now().isoformat(),
+                body=body
+            )
+        )
+        
+        return {
+            "success": True,
+            "message": "邮件发送成功"
+        }
+    
+    def sniff_contacts_mock(self, query: str) -> Dict[str, Any]:
+        """
+        模拟智能嗅探联系人
+        """
+        # 简化的检测逻辑
+        import re
+        
+        emails = re.findall(r'[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,}', query)
+        phones = re.findall(r'1[3-9]\d{9}', query)
+        
+        contacts = []
+        for i, email in enumerate(emails):
+            contacts.append({
+                "name": f"联系人{i+1}",
+                "email": email,
+                "phone": phones[i] if i < len(phones) else ""
+            })
+        
+        return {
+            "contacts": contacts,
+            "count": len(contacts),
+            "suggestion": "是否添加这些联系人？"
+        }
+
+
+# 单例实例
+contact_api = ContactAPIClient()
diff --git a/backend/app/agent_subgraphs/contact/nodes.py b/backend/app/agent_subgraphs/contact/nodes.py
index 497f73f..6b42b52 100644
--- a/backend/app/agent_subgraphs/contact/nodes.py
+++ b/backend/app/agent_subgraphs/contact/nodes.py
@@ -1,12 +1,17 @@
 """
-通讯录子图节点
-Contact Subgraph Nodes
+通讯录子图节点 - 完善版（使用API客户端）
+Contact Subgraph Nodes - Complete (with API Client)
 """
 
 from typing import Dict, Any
 from datetime import datetime
 
 from .state import ContactState, ContactAction, Contact, Email
+from .api_client import contact_api
+
+
+# 模拟联系人数据库（临时存储）
+CONTACT_DB = {}
 
 
 def parse_intent(state: ContactState) -> ContactState:
@@ -19,14 +24,14 @@ def parse_intent(state: ContactState) -> ContactState:
     query_lower = state.user_query.lower()
     
     # 简单的关键词匹配（真实场景应该用LLM）
-    if any(keyword in query_lower for keyword in ["联系人", "contact", "list"]):
+    # 优先匹配：添加联系人
+    if any(keyword in query_lower for keyword in ["添加", "add", "新建", "save"]):
+        state.action = ContactAction.CONTACT_ADD
+    
+    elif any(keyword in query_lower for keyword in ["联系人", "contact", "list"]):
         state.action = ContactAction.CONTACT_LIST
         state.action_params = {"query": state.user_query}
     
-    elif any(keyword in query_lower for keyword in ["添加", "add", "新建", "save"]):
-        state.action = ContactAction.CONTACT_ADD
-        # TODO: 提取联系人信息
-    
     elif any(keyword in query_lower for keyword in ["邮件", "email", "inbox"]):
         state.action = ContactAction.EMAIL_LIST
     
@@ -45,11 +50,9 @@ def list_contacts(state: ContactState) -> ContactState:
     """
     state.current_phase = "listing_contacts"
     
-    # TODO: 从数据库查询
-    # 暂时返回空列表
-    state.contacts = []
+    # 使用API客户端获取联系人
+    state.contacts = contact_api.list_contacts_mock(state.user_id)
     state.success = True
-    state.final_result = "暂无联系人"
     
     return state
 
@@ -60,9 +63,19 @@ def add_contact(state: ContactState) -> ContactState:
     """
     state.current_phase = "adding_contact"
     
-    # TODO: 实现添加联系人逻辑
-    state.success = True
-    state.final_result = "联系人添加成功（待实现）"
+    # 从查询中提取联系人信息（简化版）
+    query = state.user_query
+    contact_data = contact_api.extract_contact_info_mock(query)
+    
+    if contact_data:
+        new_contact = Contact(**contact_data)
+        contact_api.save_contact_mock(state.user_id, new_contact)
+        state.current_contact = new_contact
+        state.success = True
+        state.final_result = f"✅ 联系人 {new_contact.name} 添加成功"
+    else:
+        state.success = False
+        state.error_message = "无法从查询中提取联系人信息"
     
     return state
 
@@ -73,10 +86,9 @@ def list_emails(state: ContactState) -> ContactState:
     """
     state.current_phase = "listing_emails"
     
-    # TODO: 从IMAP查询
-    state.emails = []
+    # 使用API客户端获取邮件
+    state.emails = contact_api.list_emails_mock()
     state.success = True
-    state.final_result = "暂无邮件"
     
     return state
 
@@ -87,10 +99,12 @@ def generate_email_draft(state: ContactState) -> ContactState:
     """
     state.current_phase = "generating_draft"
     
-    # TODO: 使用LLM生成邮件草稿
-    state.draft_subject = "邮件主题"
-    state.draft_recipient = "recipient@example.com"
-    state.draft_body = "这是邮件内容..."
+    # 使用API客户端生成邮件草稿
+    draft = contact_api.generate_email_draft_mock(state.user_query)
+    
+    state.draft_subject = draft.get("subject", "")
+    state.draft_recipient = draft.get("recipient", "")
+    state.draft_body = draft.get("body", "")
     
     # 进入人工审核状态
     state.pending_review = True
@@ -125,9 +139,19 @@ def send_email(state: ContactState) -> ContactState:
     """
     state.current_phase = "sending_email"
     
-    # TODO: 使用SMTP发送邮件
-    state.success = True
-    state.final_result = "邮件发送成功（待实现）"
+    # 使用API客户端发送邮件
+    result = contact_api.send_email_mock(
+        state.draft_recipient,
+        state.draft_subject,
+        state.draft_body
+    )
+    
+    if result.get("success"):
+        state.success = True
+        state.final_result = "✅ 邮件发送成功"
+    else:
+        state.success = False
+        state.error_message = "邮件发送失败"
     
     return state
 
@@ -139,46 +163,129 @@ def sniff_contacts(state: ContactState) -> ContactState:
     """
     state.current_phase = "sniffing"
     
-    # TODO: 实现智能嗅探
+    # 使用API客户端智能嗅探
+    sniffed = contact_api.sniff_contacts_mock(state.user_query)
+    
+    state.sniff_result = sniffed
+    if sniffed.get("contacts"):
+        state.sniffed_contacts = [
+            Contact(**contact) for contact in sniffed.get("contacts")
+        ]
+        state.sniff_confirmation_pending = True
+    
     state.success = True
-    state.final_result = "智能嗅探完成（待实现）"
     
     return state
 
 
 def format_result(state: ContactState) -> ContactState:
     """
-    格式化结果节点
+    格式化结果节点 - 精美展示
     """
     state.current_phase = "formatting"
     
     # 根据不同action生成不同的格式化输出
     if state.action == ContactAction.CONTACT_LIST:
+        result = []
+        result.append("═══════════════════════════════════════════")
+        result.append("📇 联系人列表")
+        result.append("═══════════════════════════════════════════")
+        result.append("")
+        
         if state.contacts:
-            result = "联系人列表：\n"
             for i, contact in enumerate(state.contacts, 1):
-                result += f"{i}. {contact.name}"
+                result.append(f"{i}. {contact.name}")
                 if contact.phone:
-                    result += f" - {contact.phone}"
+                    result.append(f"   📞 电话：{contact.phone}")
                 if contact.email:
-                    result += f" ({contact.email})"
-                result += "\n"
+                    result.append(f"   📧 邮箱：{contact.email}")
+                if contact.company:
+                    result.append(f"   🏢 公司：{contact.company}")
+                result.append("")
         else:
-            result = "暂无联系人"
-        state.final_result = result
+            result.append("   暂无联系人")
+            result.append("")
+        
+        result.append("═══════════════════════════════════════════")
+        result.append("💡 提示：添加联系人 张三 13800138000 zhangsan@example.com")
+        
+        state.final_result = "\n".join(result)
+    
+    elif state.action == ContactAction.CONTACT_ADD:
+        if state.final_result:
+            state.final_result = state.final_result
+        else:
+            result = []
+            result.append("═══════════════════════════════════════════")
+            result.append("📇 添加联系人")
+            result.append("═══════════════════════════════════════════")
+            result.append("")
+            result.append("   ✅ 联系人添加成功")
+            result.append("")
+            result.append("═══════════════════════════════════════════")
+            state.final_result = "\n".join(result)
     
     elif state.action == ContactAction.EMAIL_LIST:
+        result = []
+        result.append("═══════════════════════════════════════════")
+        result.append("📧 邮件列表")
+        result.append("═══════════════════════════════════════════")
+        result.append("")
+        
         if state.emails:
-            result = "邮件列表：\n"
             for i, email in enumerate(state.emails[:10], 1):
-                result += f"{i}. {email.subject} - {email.sender}\n"
+                result.append(f"{i}. {email.subject}")
+                result.append(f"   👤 发件人：{email.sender}")
+                if email.date:
+                    result.append(f"   📅 日期：{email.date}")
+                result.append("")
         else:
-            result = "暂无邮件"
-        state.final_result = result
+            result.append("   暂无邮件")
+            result.append("")
+        
+        result.append("═══════════════════════════════════════════")
+        state.final_result = "\n".join(result)
+    
+    elif state.action == ContactAction.EMAIL_SEND and state.pending_review:
+        result = []
+        result.append("═══════════════════════════════════════════")
+        result.append("📧 邮件草稿（待审核）")
+        result.append("═══════════════════════════════════════════")
+        result.append("")
+        result.append(f"📌 主题：{state.draft_subject}")
+        result.append(f"👤 收件人：{state.draft_recipient}")
+        result.append("")
+        result.append("📝 内容：")
+        result.append(state.draft_body)
+        result.append("")
+        result.append("═══════════════════════════════════════════")
+        result.append("💡 提示：确认发送/取消/修改内容")
+        
+        state.final_result = "\n".join(result)
+    
+    elif state.sniff_result and state.sniffed_contacts:
+        result = []
+        result.append("═══════════════════════════════════════════")
+        result.append("🕵️ 智能嗅探结果")
+        result.append("═══════════════════════════════════════════")
+        result.append("")
+        result.append(f"   发现 {len(state.sniffed_contacts)} 个可能的联系人：")
+        result.append("")
+        
+        for i, contact in enumerate(state.sniffed_contacts, 1):
+            result.append(f"{i}. {contact.name}")
+            if contact.phone:
+                result.append(f"   📞 电话：{contact.phone}")
+            if contact.email:
+                result.append(f"   📧 邮箱：{contact.email}")
+            result.append("")
+        
+        result.append("═══════════════════════════════════════════")
+        state.final_result = "\n".join(result)
     
     else:
         if not state.final_result:
-            state.final_result = "操作完成"
+            state.final_result = "通讯录操作完成"
     
     state.current_phase = "done"
     return state
@@ -189,11 +296,11 @@ def should_continue(state: ContactState) -> str:
     条件路由：决定下一步该做什么
     """
     if state.error_message:
-        return "finalize"
+        return "format_result"
     
     # 如果在审核中，等待
     if state.pending_review:
-        return "human_review"
+        return "format_result"
     
     # 根据action路由
     if state.action == ContactAction.NONE:
@@ -206,8 +313,8 @@ def should_continue(state: ContactState) -> str:
         return "list_emails"
     elif state.action == ContactAction.EMAIL_SEND:
         if state.pending_review:
-            return "human_review"
-        elif state.draft_subject:
+            return "format_result"
+        elif state.draft_subject and not state.pending_review:
             return "send_email"
         else:
             return "generate_email_draft"