diff --git a/shierfeng-fastapi-backend/module_business/dependency/test_batch_dependency.py b/shierfeng-fastapi-backend/module_business/dependency/test_batch_dependency.py
index 1185ae3..4cb87f2 100644
--- a/shierfeng-fastapi-backend/module_business/dependency/test_batch_dependency.py
+++ b/shierfeng-fastapi-backend/module_business/dependency/test_batch_dependency.py
@@ -16,7 +16,10 @@ def parse_optional_positive_batch_id(raw: str | None) -> int | None:
         return None
     if not isinstance(raw, str) or not raw or not raw.isascii() or not raw.isdigit():
         raise ServiceWarning('', '测试批次标识必须为正整数')
-    batch_id = int(raw)
+    try:
+        batch_id = int(raw)
+    except ValueError:
+        raise ServiceWarning('', '测试批次标识必须为正整数') from None
     if batch_id <= 0:
         raise ServiceWarning('', '测试批次标识必须为正整数')
     return batch_id
diff --git a/shierfeng-fastapi-backend/tests/module_business/test_test_batch_access.py b/shierfeng-fastapi-backend/tests/module_business/test_test_batch_access.py
index 7678031..c200a86 100644
--- a/shierfeng-fastapi-backend/tests/module_business/test_test_batch_access.py
+++ b/shierfeng-fastapi-backend/tests/module_business/test_test_batch_access.py
@@ -87,6 +87,10 @@ class TestBatchHeaderTest(unittest.TestCase):
             with self.subTest(raw=raw), self.assertRaisesRegex(ServiceWarning, '测试批次标识必须为正整数'):
                 parse_optional_positive_batch_id(raw)
 
+    def test_overlong_ascii_decimal_is_mapped_to_service_warning(self) -> None:
+        with self.assertRaisesRegex(ServiceWarning, '测试批次标识必须为正整数'):
+            parse_optional_positive_batch_id('9' * 5000)
+
 
 class TestBatchAccessTest(unittest.IsolatedAsyncioTestCase):
     async def asyncSetUp(self) -> None: