diff --git a/data_platform/daily_all_update.py b/data_platform/daily_all_update.py
index 045e9d71..491c5be2 100644
--- a/data_platform/daily_all_update.py
+++ b/data_platform/daily_all_update.py
@@ -821,6 +821,12 @@ def run_15min_update(codes: List[str], local_conn: sqlite3.Connection) -> dict:
 
             existing = pd.read_parquet(parquet_path)
             existing["day"] = existing["day"].astype(str)
+            # 统一类型：旧数据volume/amount可能是str，新数据是float
+            for col in ["volume", "amount", "open", "high", "low", "close"]:
+                if col in existing.columns:
+                    existing[col] = pd.to_numeric(existing[col], errors="coerce").fillna(0)
+                if col in df_increment.columns:
+                    df_increment[col] = pd.to_numeric(df_increment[col], errors="coerce").fillna(0)
             combined = pd.concat([existing, df_increment], ignore_index=True)
             combined = combined.sort_values("day").reset_index(drop=True)
             new_rows = len(df_increment)