diff --git a/common/data_source/rdbms_connector.py b/common/data_source/rdbms_connector.py
index 41901bf01..944bfdb55 100644
--- a/common/data_source/rdbms_connector.py
+++ b/common/data_source/rdbms_connector.py
@@ -204,7 +204,9 @@ class RDBMSConnector(LoadConnector, PollConnector):
                 value = row_dict[col]
                 if isinstance(value, (dict, list)):
                     value = json.dumps(value, ensure_ascii=False)
-                content_parts.append(f"{col}: {value}")
+                # Use brackets around field name to ensure it's distinguishable
+                # after chunking (TxtParser strips \n delimiters during merge)
+                content_parts.append(f"【{col}】: {value}")
         
         content = "\n".join(content_parts)