diff --git a/src/sync_writer.py b/src/sync_writer.py
index db5ecba..1a869f2 100644
--- a/src/sync_writer.py
+++ b/src/sync_writer.py
@@ -104,17 +104,6 @@ def _sanitize_rows(rows, fields, import_col, limits, dt_cols):
     return out
 
 
-# 列类型 -> schema.ini 类别映射（文本/日期/数值）
-_TYPE_MAP = {
-    "VARCHAR": "text", "CHAR": "text", "TEXT": "text", "LONGVARCHAR": "text",
-    "LONGCHAR": "text", "MEMO": "text",
-    "DATETIME": "date", "DATE": "date", "TIME": "date",
-    "INTEGER": "int", "SMALLINT": "int", "BIGINT": "int", "TINYINT": "int",
-    "COUNTER": "int", "AUTOINCREMENT": "int",
-    "DOUBLE": "float", "SINGLE": "float", "REAL": "float",
-    "DECIMAL": "float", "NUMERIC": "float", "CURRENCY": "float", "MONEY": "float",
-    "BIT": "bit", "YESNO": "bit", "BOOLEAN": "bit",
-}
 
 
 def _access_cols(cn, table):
@@ -128,14 +117,17 @@ def _access_cols(cn, table):
 
 
 def _schema_type(col, meta):
-    tn, size = meta.get(col, ("", None))
-    cat = _TYPE_MAP.get(tn, "text")
-    if cat == "text":
-        # ACE 对部分表(尤其 ADOX 建的)报告的列宽可能为 None，
-        # Text ISAM 不接受 Width 0，故无宽度时兜底 255
-        return f"Text Width {size if size else 255}"
-    return {"date": "DateTime", "int": "Integer",
-            "float": "Double", "bit": "Bit"}.get(cat, "Text Width 0")
+    """只输出 Access Text ISAM 永远接受的两种合法值，杜绝 -5402 非法选项。
+
+    - 日期/时间列 -> DateTime（Text 驱动据此解析日期）
+    - 其余（文本/数值/布尔等）-> Text Width 255
+      （插入时 Access 按目标列真实类型自动强制转换，故无需精确声明）
+    """
+    tn, _ = meta.get(col, ("", None))
+    t = (tn or "").upper()
+    if "DAT" in t or "DATE" in t or "TIME" in t:
+        return "DateTime"
+    return "Text Width 255"
 
 
 def _csv_val(v):