diff --git a/packages/mock/lib/index.ts b/packages/mock/lib/index.ts
index 90d7803..57643d7 100644
--- a/packages/mock/lib/index.ts
+++ b/packages/mock/lib/index.ts
@@ -1,4 +1,4 @@
-import utils from "./shared";
+import * as utils from "./shared";
 import use from "./core/use";
 import mock from "./core";
 export { utils, use, mock };
diff --git a/packages/mock/lib/random/address/city.ts b/packages/mock/lib/random/address/city.ts
index 735770a..eadb6da 100644
--- a/packages/mock/lib/random/address/city.ts
+++ b/packages/mock/lib/random/address/city.ts
@@ -1,11 +1,11 @@
-const addrData = require("./address_ch.json");
-const { sample } = require("../../utils");
+import addrData from "./address_ch.json";
+import { sample } from '../../shared';
 /**
  *
  * @param {Boolean | String} args 是否同时显示完整 | 指定省份下的城市
  * @returns string
  */
-module.exports = (...args) => {
+module.exports = (...args:any[]) => {
   const isFull =
     (args.length === 1 && args[0] === true) ||
     (args.length === 2 && args[1] === true);
diff --git a/packages/mock/lib/random/basic/char.ts b/packages/mock/lib/random/basic/char.ts
index 1aa1e7c..370cd09 100644
--- a/packages/mock/lib/random/basic/char.ts
+++ b/packages/mock/lib/random/basic/char.ts
@@ -1,9 +1,8 @@
-import { sample } from "../../shared";
+import { repeat } from "../../shared";
 
-const strs = "abcdefghijklmnopqrstuvwxyz";
 /**
  * 返回26个字母中的任意一个
  * @example
  * '@char'
  */
-export default () => sample(strs.split(""));
+export default () => repeat(2, 1);
diff --git a/packages/mock/lib/random/basic/string.ts b/packages/mock/lib/random/basic/string.ts
index 95fc132..7dc7e10 100644
--- a/packages/mock/lib/random/basic/string.ts
+++ b/packages/mock/lib/random/basic/string.ts
@@ -1,9 +1,4 @@
-import char from "./char";
+import { repeat } from '../../shared'
 export default (min = 3, max = 10) => {
-  let ret = "";
-  const len = min + parseInt(Math.random() * (max - min));
-  for (let i = 0; i < len; i++) {
-    ret += char();
-  }
-  return ret;
+  return repeat(2, min, max)
 };
diff --git a/packages/mock/lib/random/color/color.ts b/packages/mock/lib/random/color/color.ts
index 8179352..cbe623f 100644
--- a/packages/mock/lib/random/color/color.ts
+++ b/packages/mock/lib/random/color/color.ts
@@ -3,7 +3,7 @@ export default () => {
 };
 
 function getRandom() {
-  const data = parseInt(Math.random()) * 256;
+  const data = parseInt((Math.random() * 256).toString());
   const raw = data === 256 ? 255 : data;
   return raw.toString(16);
 }
diff --git a/packages/mock/lib/random/color/rgb.ts b/packages/mock/lib/random/color/rgb.ts
index 881aa63..d907e8d 100644
--- a/packages/mock/lib/random/color/rgb.ts
+++ b/packages/mock/lib/random/color/rgb.ts
@@ -7,6 +7,6 @@ export default (useOpacity: boolean) => {
 };
 
 function getRandom() {
-  const data = parseInt(Math.random()) * 256;
+  const data = parseInt((Math.random() * 256).toString());
   return data === 256 ? 255 : data;
 }
diff --git a/packages/mock/lib/random/date/date.ts b/packages/mock/lib/random/date/date.ts
index 7a366b0..82b3e14 100644
--- a/packages/mock/lib/random/date/date.ts
+++ b/packages/mock/lib/random/date/date.ts
@@ -2,17 +2,17 @@ import dayjs from "dayjs";
 
 export default (...args: any[]) => {
   if (args.length === 0) {
-    return dayjs(parseInt(Math.random() * 1e10)).toDate();
+    return dayjs(parseInt((Math.random() * 1e10).toString())).toDate();
   } else if (args.length === 1) {
-    return dayjs(parseInt(Math.random() * 1e10)).format(args[0]);
+    return dayjs(parseInt((Math.random() * 1e10).toString())).format(args[0]);
   } else if (args.length === 3) {
     const [type, date, format] = args;
     if (type === "before") {
       const max = dayjs(date).unix();
-      return dayjs(parseInt(Math.random() * max)).format(format);
+      return dayjs(parseInt((Math.random() * max).toString())).format(format);
     } else if (type === "after") {
       const max = dayjs().add(1, "y").unix();
-      return dayjs(parseInt(Math.random() * max)).format(format);
+      return dayjs(parseInt((Math.random() * max).toString())).format(format);
     }
   }
 };
diff --git a/packages/mock/lib/shared/index.ts b/packages/mock/lib/shared/index.ts
index 6311f36..6b8915e 100644
--- a/packages/mock/lib/shared/index.ts
+++ b/packages/mock/lib/shared/index.ts
@@ -1,12 +1,19 @@
 // import { fill } from "lodash-es";
-import { fixContinuousNumber } from "@linzb93/utils";
 
 export const sample = (list: any[]) => {
   return list[parseInt((Math.random() * list.length).toString())];
 };
 
-export const repeat = (type: 1 | 2 | 3, min: number, max: number) => {
-  // 1 纯数字，2纯字母，3混合
+const fixContinuousNumber = (num:number) => Array(num).fill('').map((_, index) => index + 1);
+
+/**
+ * 重复
+ * @param {number} type - 1 纯数字，2纯字母，3混合
+ * @param {number} min 重复次数，如果max存在的话就是重复最小次数
+ * @param {number} max 重复最大次数
+ * @returns 
+ */
+export const repeat = (type: 1 | 2 | 3, min: number, max?: number) => {
   let ret = "";
   const numList = fixContinuousNumber(10);
   const letters = "abcdefghijklmnopqrstuvwxyz";
@@ -23,7 +30,8 @@ export const repeat = (type: 1 | 2 | 3, min: number, max: number) => {
       }
       return Number(ret);
     }
-  } else if (type === 2) {
+  }
+  if (type === 2) {
     if (!max) {
       for (let i = 0; i < min; i++) {
         ret += sample(letters.split(""));
@@ -36,18 +44,5 @@ export const repeat = (type: 1 | 2 | 3, min: number, max: number) => {
       }
       return Number(ret);
     }
-  } else {
-    if (!max) {
-      for (let i = 0; i < min; i++) {
-        ret += sample(letters.split("").concat(numList));
-      }
-      return Number(ret);
-    } else {
-      const len = min + parseInt((Math.random() * (max - min)).toString());
-      for (let i = min; i < len; i++) {
-        ret += sample(letters.split("").concat(numList));
-      }
-      return Number(ret);
-    }
   }
 };