diff --git a/packages/utils/src/index.ts b/packages/utils/src/index.ts
index fbc9d0d0b..d490a7cc4 100644
--- a/packages/utils/src/index.ts
+++ b/packages/utils/src/index.ts
@@ -1,12 +1,4 @@
-import deepmerge from 'deepmerge';
-
-const overwriteMerge = (destinationArray, sourceArray, options) => sourceArray;
-
-export function merge(obj1: any, obj2: any) {
-  return deepmerge(obj1, obj2, {
-    arrayMerge: overwriteMerge,
-  });
-}
-
+export * from './merge';
 export * from './mixin';
 export * from './mixin/AsyncEmitter';
+export * from './uid';
diff --git a/packages/utils/src/merge.ts b/packages/utils/src/merge.ts
new file mode 100644
index 000000000..1fc8a3358
--- /dev/null
+++ b/packages/utils/src/merge.ts
@@ -0,0 +1,9 @@
+import deepmerge from 'deepmerge';
+
+const overwriteMerge = (destinationArray, sourceArray, options) => sourceArray;
+
+export function merge(obj1: any, obj2: any) {
+  return deepmerge(obj1, obj2, {
+    arrayMerge: overwriteMerge,
+  });
+}
diff --git a/packages/utils/src/uid.ts b/packages/utils/src/uid.ts
new file mode 100644
index 000000000..e3e576fe6
--- /dev/null
+++ b/packages/utils/src/uid.ts
@@ -0,0 +1,10 @@
+let IDX = 36,
+  HEX = '';
+while (IDX--) HEX += IDX.toString(36);
+
+export function uid(len?: number) {
+  let str = '',
+    num = len || 11;
+  while (num--) str += HEX[(Math.random() * 36) | 0];
+  return str;
+}