diff --git a/api.py b/api.py
index bb9b7ea..e6e74e1 100644
--- a/api.py
+++ b/api.py
@@ -83,6 +83,7 @@ def _parse_stocks(raw: str) -> tuple[list[str], Optional[dict[str, str]]]:
 def _df_to_json_payload(df: pd.DataFrame) -> dict:
     """DataFrame -> JSON-safe dict."""
     import math
+    import re
     safe = df.copy()
     # 处理 NaN / NaT / Timestamp / inf -> None
     for col in safe.columns:
@@ -103,6 +104,11 @@ def _df_to_json_payload(df: pd.DataFrame) -> dict:
                     new_row[k] = None
                 else:
                     new_row[k] = v
+            elif isinstance(v, str):
+                # 去除 ASCII 控制字符 (除 \t \n \r 外), 防止 JSON 解析失败
+                # 长文本字段 (如 ORG_PROFILE) 可能含 \f \v 等非标准换行
+                v = re.sub(r'[\x00-\x08\x0b\x0c\x0e-\x1f\x7f]', '', v)
+                new_row[k] = v
             else:
                 new_row[k] = v
         cleaned.append(new_row)