diff --git a/common/common-online/src/main/java/apelet/common/online/controller/OnlineFormController.java b/common/common-online/src/main/java/apelet/common/online/controller/OnlineFormController.java
index 43fd688..fac7040 100644
--- a/common/common-online/src/main/java/apelet/common/online/controller/OnlineFormController.java
+++ b/common/common-online/src/main/java/apelet/common/online/controller/OnlineFormController.java
@@ -674,8 +674,9 @@ public class OnlineFormController {
                 Integer widgetType = widget.getInteger("widgetType");
                 if (!isTableColumn && (widgetType == null || !WidgetFieldTypeMapping.isDataWidget(widgetType))) continue;
                 if (isTableColumn) {
-                    // 子表列：字段类型沿用现状，硬编码 750
-                    this.saveField(750, widget.getString("showName"), null, head, columnName, extractSlaveTableId(widget));
+                    // 子表列：按 comType 从映射表取字段类型，未映射则回退 varchar(750)
+                    Integer comType = widget.getInteger("comType");
+                    this.saveField(WidgetFieldTypeMapping.isDataWidget(comType) ? comType : 750, widget.getString("showName"), null, head, columnName, extractSlaveTableId(widget));
                     // 子表列：已有 variableName 标签才转驼峰反写字段名，没有则不动
                     if (widget.containsKey("variableName")) {
                         widget.put("variableName", StrUtil.toCamelCase(columnName));