diff --git a/backend/app/routers/information.py b/backend/app/routers/information.py
index 2ea2caa..82db926 100644
--- a/backend/app/routers/information.py
+++ b/backend/app/routers/information.py
@@ -1279,7 +1279,7 @@ async def batch_parse_deals(text: str = Body(..., embed=True)):
                 data = json.loads(content.strip())
                 # 对AI返回的数据进行冠字号矫正
                 def normalize_serial_ai(num_str):
-                    """矫正冠字号：确保是J0+9位数字，最后两位为01"""
+                    """矫正冠字号：确保是J0+9位数字"""
                     if not num_str.startswith('J0'):
                         return None
                     num = num_str[2:]  # 去掉J0
@@ -1289,17 +1289,19 @@ async def batch_parse_deals(text: str = Body(..., embed=True)):
                     elif diff == -1:
                         # 多1位，去掉倒数第4位
                         if len(num) >= 4:
-                            num = num[:-4] + num[-3:]
-                            if len(num) == 9:
-                                return 'J0' + num
+                            result = num[:5] + num[-4:]
+                            if len(result) == 9:
+                                return 'J0' + result
+                            result2 = num[:4] + num[-5:]
+                            if len(result2) == 9:
+                                return 'J0' + result2
                     elif diff == 1:
-                        # 少1位，加0
                         return 'J0' + '0' + num
                     elif diff == -2:
                         if len(num) >= 5:
-                            num = num[:-5] + num[-4:]
-                            if len(num) == 9:
-                                return 'J0' + num
+                            result = num[:5] + num[-4:]
+                            if len(result) == 9:
+                                return 'J0' + result
                     elif diff == 2:
                         return 'J0' + '00' + num
                     return None
@@ -1379,33 +1381,32 @@ def parse_deals_locally(text: str, default_packaging: str = '', default_date: st
         
         # 冠字号矫正函数
         def normalize_serial(num_str):
-            """矫正冠字号：确保是J0+9位数字，最后两位为01"""
+            """矫正冠字号：确保是J0+9位数字"""
             num = num_str
             diff = 9 - len(num)
             if diff == 0:
-                # 正好9位，检查最后两位是否为01
-                if num[-2:] != '01':
-                    # 尝试矫正：去掉倒数第4位（如果倒数第4位不是0）
-                    if len(num) >= 4 and num[-4] != '0':
-                        num = num[:-4] + num[-3:]
-                        if num[-2:] == '01':
-                            return 'J0' + num
                 return 'J0' + num
             elif diff == -1:
                 # 多1位（10位数字）→ 去掉倒数第4位
+                # 例如: 298810101 → 去掉第4位(0) → 2988101 + 01 = 298810101 (9位)
                 if len(num) >= 4:
-                    num = num[:-4] + num[-3:]
-                    if len(num) == 9:
-                        return 'J0' + num
+                    # 取前5位 + 最后4位
+                    result = num[:5] + num[-4:]
+                    if len(result) == 9:
+                        return 'J0' + result
+                    # 如果还是不对，尝试去掉第5位
+                    result2 = num[:4] + num[-5:]
+                    if len(result2) == 9:
+                        return 'J0' + result2
             elif diff == 1:
                 # 少1位（8位数字）→ 在J0后加0
                 return 'J0' + '0' + num
             elif diff == -2:
                 # 多2位（11位数字）→ 去掉倒数第4、5位
                 if len(num) >= 5:
-                    num = num[:-5] + num[-4:]
-                    if len(num) == 9:
-                        return 'J0' + num
+                    result = num[:5] + num[-4:]
+                    if len(result) == 9:
+                        return 'J0' + result
             elif diff == 2:
                 # 少2位（7位数字）→ 在J0后加00
                 return 'J0' + '00' + num