diff --git a/packages/form/src/form-item.vue b/packages/form/src/form-item.vue
index 87bdce504e..24f437063a 100644
--- a/packages/form/src/form-item.vue
+++ b/packages/form/src/form-item.vue
@@ -63,7 +63,10 @@ export default defineComponent({
   },
   props: {
     label: String,
-    labelWidth: [String, Number],
+    labelWidth: {
+      type: [String, Number],
+      default: '',
+    },
     prop: String,
     required: {
       type: Boolean,
diff --git a/packages/form/src/form.vue b/packages/form/src/form.vue
index 46bfdffd9f..6f888e401d 100644
--- a/packages/form/src/form.vue
+++ b/packages/form/src/form.vue
@@ -67,7 +67,10 @@ export default defineComponent({
     model: Object,
     rules: Object as PropType<FormRulesMap>,
     labelPosition: String,
-    labelWidth: [String, Number],
+    labelWidth: {
+      type: [String, Number],
+      default: '',
+    },
     labelSuffix: {
       type: String,
       default: '',