diff --git a/app/api/endpoints/merchant_order.py b/app/api/endpoints/merchant_order.py
index 41fd645..dcffc1b 100644
--- a/app/api/endpoints/merchant_order.py
+++ b/app/api/endpoints/merchant_order.py
@@ -247,7 +247,8 @@ async def merchant_cancel_order(
         wechat = WeChatClient()
         await wechat.apply_refund(
             order_id=order.order_id,
-            total_amount=int(float(order.pay_amount) * 100) if not settings.DEBUG else 1,  # 转换为分
+            total_amount=int(float(order.pay_amount) * 100) if not settings.DEBUG else 1,  # 转换为分，订单总金额
+            refund_amount=int(float(order.pay_amount) * 100) if not settings.DEBUG else 1,  # 转换为分，退款金额
             reason="商家取消订单"
         )
         return success_response(data=MerchantOrderInfo.model_validate(order))
@@ -278,7 +279,8 @@ async def user_cancel_order(
         wechat = WeChatClient()
         await wechat.apply_refund(
             order_id=order.order_id,
-            total_amount=int(float(order.pay_amount) * 100) if not settings.DEBUG else 1,  # 转换为分
+            total_amount=int(float(order.pay_amount) * 100) if not settings.DEBUG else 1,  # 转换为分，订单总金额
+            refund_amount=int(float(order.pay_amount) * 100) if not settings.DEBUG else 1,  # 转换为分，退款金额
             reason="用户取消订单"
         )
         return success_response(data=MerchantOrderInfo.model_validate(order))
@@ -554,7 +556,8 @@ async def apply_refund(
         wechat = WeChatClient()
         await wechat.apply_refund(
             order_id=order.order_id,
-            total_amount=int(float(order.pay_amount) * 100) if not settings.DEBUG else 1,  # 转换为分
+            total_amount=int(float(order.pay_amount) * 100) if not settings.DEBUG else 1,  # 转换为分，订单总金额
+            refund_amount=int(float(order.pay_amount) * 100) if not settings.DEBUG else 1,  # 转换为分，退款金额
             reason="用户申请退款"
         )
 
diff --git a/app/api/endpoints/order.py b/app/api/endpoints/order.py
index abe023f..fb1108c 100644
--- a/app/api/endpoints/order.py
+++ b/app/api/endpoints/order.py
@@ -912,7 +912,8 @@ async def cancel_order(
             wechat = WeChatClient()
             await wechat.apply_refund(
                 order_id=order.orderid,
-                total_amount=int(float(order.final_amount) * 100) if not settings.DEBUG else 1,  # 转换为分
+                total_amount=int(float(order.final_amount) * 100) if not settings.DEBUG else 1,  # 订单总金额(分)
+                refund_amount=int(float(order.final_amount) * 100) if not settings.DEBUG else 1,  # 退款金额(分)
                 reason="用户取消订单"
             )
 
@@ -1174,7 +1175,8 @@ async def deliveryman_cancel_order(
             wechat = WeChatClient()
             await wechat.apply_refund(
                 order_id=order.orderid,
-                total_amount=int(float(order.final_amount) * 100) if not settings.DEBUG else 1,  # 转换为分
+                total_amount=int(float(order.final_amount) * 100) if not settings.DEBUG else 1,  # 订单总金额(分)
+                refund_amount=int(float(order.final_amount) * 100) if not settings.DEBUG else 1,  # 退款金额(分)
                 reason="配送员取消订单"
             )
 
@@ -1616,8 +1618,9 @@ async def refund_order_amount(
         wechat = WeChatClient()
         await wechat.apply_refund(
             order_id=order.orderid,
-            total_amount=int(float(request.amount) * 100) if not settings.DEBUG else 1,  # 转换为分
-            reason="后台退款"
+            total_amount=int(float(order.final_amount + request.amount) * 100) if not settings.DEBUG else 1,  # 原订单总金额(分)
+            refund_amount=int(float(request.amount) * 100) if not settings.DEBUG else 1,  # 本次退款金额(分)
+            reason=request.reason or "后台退款"
         )
 
         db.commit()
diff --git a/app/core/wechat.py b/app/core/wechat.py
index bae9a52..0de488e 100644
--- a/app/core/wechat.py
+++ b/app/core/wechat.py
@@ -370,6 +370,7 @@ class WeChatClient:
         self,
         order_id: str,
         total_amount: int,
+        refund_amount: int = None,
         reason: str = "用户申请退款"
     ) -> dict:
         """
@@ -377,14 +378,19 @@ class WeChatClient:
         
         Args:
             order_id: 订单号(同时作为退款单号)
-            total_amount: 退款金额(分)
+            total_amount: 订单总金额(分)
+            refund_amount: 退款金额(分)，默认为None时等于total_amount（全额退款）
             reason: 退款原因
             
         Returns:
             dict: 退款结果
         """
         try:
-            print(f"开始申请退款: order_id={order_id}, amount={total_amount}")
+            # 如果未指定退款金额，默认全额退款
+            if refund_amount is None:
+                refund_amount = total_amount
+                
+            print(f"开始申请退款: order_id={order_id}, total_amount={total_amount}, refund_amount={refund_amount}")
             # 生成随机字符串
             nonce_str = generate_random_string()
             timestamp = str(int(time.time()))
@@ -396,17 +402,17 @@ class WeChatClient:
             # 构建请求体
             body = {
                 "out_trade_no": order_id,  # 商户订单号，二选一
-                "out_refund_no": f"refund_{order_id}",  # 商户退款单号
+                "out_refund_no": f"refund_{order_id}_{int(time.time())}",  # 商户退款单号，加入时间戳避免重复
                 "reason": reason,
                 "notify_url": f"{settings.API_BASE_URL}/api/wechat/refund/notify",
                 "amount": {
-                    "refund": total_amount,  # 退款金额
+                    "refund": refund_amount,  # 退款金额
                     "total": total_amount,   # 原订单金额
                     "currency": "CNY"
                 }
             }
 
-             # 生成签名
+            # 生成签名
             nonce_str, timestamp, signature = self.sign_message("POST", url_path, body)
             
             # 构建认证头
diff --git a/jobs.sqlite b/jobs.sqlite
index 4aa7045..b100100 100644
Binary files a/jobs.sqlite and b/jobs.sqlite differ