diff --git a/components/_util/props-util.js b/components/_util/props-util/index.js
similarity index 100%
rename from components/_util/props-util.js
rename to components/_util/props-util/index.js
diff --git a/components/_util/props-util/initDefaultProps.ts b/components/_util/props-util/initDefaultProps.ts
new file mode 100644
index 000000000..3b1a58e9a
--- /dev/null
+++ b/components/_util/props-util/initDefaultProps.ts
@@ -0,0 +1,24 @@
+import { VueTypeValidableDef, VueTypeDef } from 'vue-types';
+
+const initDefaultProps = <T>(
+  propTypes: T,
+  defaultProps: {
+    [K in keyof T]?: T[K] extends VueTypeValidableDef<infer U>
+      ? U
+      : T[K] extends VueTypeDef<infer U>
+      ? U
+      : any;
+  },
+): T => {
+  Object.keys(defaultProps).forEach(k => {
+    const prop = propTypes[k] as VueTypeValidableDef;
+    if (prop) {
+      prop.default = defaultProps[k];
+    } else {
+      throw new Error(`not have ${k} prop`);
+    }
+  });
+  return propTypes;
+};
+
+export default initDefaultProps;