diff --git a/src/main/java/cn/iocoder/dashboard/framework/validator/custom/handler/SizeHandler.java b/src/main/java/cn/iocoder/dashboard/framework/validator/custom/handler/SizeHandler.java
new file mode 100644
index 0000000000..7f07a552d4
--- /dev/null
+++ b/src/main/java/cn/iocoder/dashboard/framework/validator/custom/handler/SizeHandler.java
@@ -0,0 +1,42 @@
+package cn.iocoder.dashboard.framework.validator.custom.handler;
+
+import org.slf4j.helpers.MessageFormatter;
+
+import javax.validation.constraints.Size;
+
+/**
+ * <p>长度校验处理类
+ *
+ * @author xyf
+ * @date 2021/5/13
+ */
+public class SizeHandler implements ValidateAnnotationHandler<Size> {
+
+    /**
+     * 小于等于
+     */
+    private static final String VALUE_LT = "长度必须大于等于{}!";
+    /**
+     * 大于等于
+     */
+    private static final String VALUE_GT = "长度必须小于等于{}!";
+
+    @Override
+    public Class<Size> getAnnotation() {
+        return Size.class;
+    }
+
+    @Override
+    public String validate(Size validateAnnotation, Object fieldValue) {
+        if (fieldValue.toString().length() > validateAnnotation.max()) {
+            return MessageFormatter.format(VALUE_GT, fieldValue).getMessage();
+        }
+
+        if (fieldValue.toString().length() < validateAnnotation.min()) {
+            return MessageFormatter.format(VALUE_LT, fieldValue).getMessage();
+        }
+
+        return null;
+    }
+
+}
\ No newline at end of file
diff --git a/src/main/java/cn/iocoder/dashboard/framework/validator/custom/handler/ValidateHandlerHelper.java b/src/main/java/cn/iocoder/dashboard/framework/validator/custom/handler/ValidateHandlerHelper.java
index 1d4393ab6f..c9739c84df 100644
--- a/src/main/java/cn/iocoder/dashboard/framework/validator/custom/handler/ValidateHandlerHelper.java
+++ b/src/main/java/cn/iocoder/dashboard/framework/validator/custom/handler/ValidateHandlerHelper.java
@@ -31,6 +31,7 @@ public class ValidateHandlerHelper {
         handlerSet.add(new NotBlankHandler());
         handlerSet.add(new MaxHandler());
         handlerSet.add(new MinHandler());
+        handlerSet.add(new SizeHandler());
     }