diff --git a/app/api/endpoints/account.py b/app/api/endpoints/account.py
index a85eca3..a67a20a 100644
--- a/app/api/endpoints/account.py
+++ b/app/api/endpoints/account.py
@@ -89,6 +89,7 @@ class AccountDetailItem(BaseModel):
     amount: float
     type: AccountDetailType
     description: str
+    transaction_id: Optional[str] = None
     create_time: datetime
     
     class Config:
@@ -136,6 +137,7 @@ async def list_account_details(
             "amount": float(detail.amount),
             "type": detail.type,
             "description": detail.description,
+            "transaction_id": detail.transaction_id,
             "create_time": detail.create_time
         }
         for detail in details
diff --git a/app/api/endpoints/merchant_order.py b/app/api/endpoints/merchant_order.py
index 527225d..955d9c6 100644
--- a/app/api/endpoints/merchant_order.py
+++ b/app/api/endpoints/merchant_order.py
@@ -184,7 +184,8 @@ async def verify_order(
         account_manager.change_balance(
             user_id=order.MerchantDB.user_id,
             amount=settlement_amount,
-            description=f"{order.MerchantProductDB.name} 订单核销"
+            description=f"{order.MerchantProductDB.name} 订单核销",
+            transaction_id=order.MerchantOrderDB.order_id
         )
         
         db.commit()
diff --git a/app/core/account.py b/app/core/account.py
index a1a9313..c62a9a8 100644
--- a/app/core/account.py
+++ b/app/core/account.py
@@ -1,6 +1,7 @@
 from sqlalchemy.orm import Session
 from app.models.user_account import UserAccountDB, AccountDetailDB, AccountDetailType
 from decimal import Decimal
+from typing import Optional
 
 class AccountManager:
     """用户账户管理类"""
@@ -24,7 +25,13 @@ class AccountManager:
         
         return account
     
-    def change_balance(self, user_id: int, amount: float, description: str) -> UserAccountDB:
+    def change_balance(
+        self, 
+        user_id: int, 
+        amount: float, 
+        description: str,
+        transaction_id: Optional[str] = None
+    ) -> UserAccountDB:
         """
         变更用户余额
         
@@ -32,6 +39,7 @@ class AccountManager:
             user_id: 用户ID
             amount: 变更金额（正数为收入，负数为支出）
             description: 变更说明
+            transaction_id: 关联订单号
         
         Returns:
             更新后的账户信息
@@ -57,7 +65,8 @@ class AccountManager:
             user_id=user_id,
             amount=decimal_amount,
             type=AccountDetailType.INCOME if decimal_amount > 0 else AccountDetailType.EXPENSE,
-            description=description
+            description=description,
+            transaction_id=transaction_id
         )
         self.db.add(detail)
         
diff --git a/app/models/merchant_order.py b/app/models/merchant_order.py
index 2853e8f..67d5738 100644
--- a/app/models/merchant_order.py
+++ b/app/models/merchant_order.py
@@ -67,7 +67,7 @@ def generate_order_id() -> str:
     date_str = now.strftime('%Y%m%d')
     # 取时间戳后7位
     timestamp = str(int(time.time() * 1000))[-7:]
-    return f"{date_str}{timestamp}"
+    return f"M{date_str}{timestamp}"
 
 def generate_verify_code() -> str:
     """生成21位数字核销码"""
diff --git a/app/models/order.py b/app/models/order.py
index f939eeb..42d196b 100644
--- a/app/models/order.py
+++ b/app/models/order.py
@@ -116,7 +116,7 @@ def generate_order_id() -> str:
     date_str = now.strftime('%Y%m%d')  # 8位日期
     # 生成6位序号（毫秒级时间戳后6位）
     timestamp = str(int(now.timestamp() * 1000))[-6:]
-    return f"{date_str}{timestamp}" 
+    return f"D{date_str}{timestamp}" 
 
 class OrderPriceInfo(BaseModel):
     package_count: int
diff --git a/app/models/user_account.py b/app/models/user_account.py
index a8a6c3a..4a2e1e4 100644
--- a/app/models/user_account.py
+++ b/app/models/user_account.py
@@ -29,6 +29,7 @@ class AccountDetailDB(Base):
     amount = Column(DECIMAL(10, 2), nullable=False)
     type = Column(Enum(AccountDetailType), nullable=False)
     description = Column(String(200), nullable=False)
+    transaction_id = Column(String(64), nullable=True)  # 关联订单号
     create_time = Column(DateTime(timezone=True), server_default=func.now())
 
 # Pydantic 模型