diff --git a/README.md b/README.md
index e69de29..4d1342c 100644
--- a/README.md
+++ b/README.md
@@ -0,0 +1,67 @@
+```js
+import SHA1 from 'crypto-js/sha1'
+import { sm4 } from 'miniprogram-sm-crypto'
+
+// 接口签名
+export const genSign = params => {
+  // 获取预先设置为环境变量的 APPKEY
+  let key = '{your secreat-key}'
+  let keys = []
+  for (let key in params) {
+    keys.push(key)
+  }
+  // 参数名 ASCII 码从小到大排序（字典序）
+  keys.sort()
+  // 转成键值对
+  let paramPair = []
+  for (let i = 0, len = keys.length; i < len; i++) {
+    let k = keys[i]
+    let itm = params[k]
+    if (typeof itm == 'object') {
+      itm = JSON.stringify(itm)
+    }
+    paramPair.push(k + '=' + itm) // base64 编码
+  }
+  // 最后加上 key
+  paramPair.push('key=' + key)
+  // 拼接
+  let stringSignTemp = paramPair.join('&')
+
+  console.log('stringSignTemp:' + stringSignTemp)
+  let sign = SHA1(stringSignTemp).toString().toUpperCase()
+
+  return sign
+}
+
+// 数据解密
+export const decodeData = data => {
+    //字符串转byte数组
+    const stringToByte = function (str) {
+        var bytes = new Array()
+        var len, c
+        len = str.length
+        for (var i = 0; i < len; i++) {
+            c = str.charCodeAt(i)
+            if (c >= 0x010000 && c <= 0x10ffff) {
+                bytes.push(((c >> 18) & 0x07) | 0xf0)
+                bytes.push(((c >> 12) & 0x3f) | 0x80)
+                bytes.push(((c >> 6) & 0x3f) | 0x80)
+                bytes.push((c & 0x3f) | 0x80)
+            } else if (c >= 0x000800 && c <= 0x00ffff) {
+                bytes.push(((c >> 12) & 0x0f) | 0xe0)
+                bytes.push(((c >> 6) & 0x3f) | 0x80)
+                bytes.push((c & 0x3f) | 0x80)
+            } else if (c >= 0x000080 && c <= 0x0007ff) {
+                bytes.push(((c >> 6) & 0x1f) | 0xc0)
+                bytes.push((c & 0x3f) | 0x80)
+            } else {
+                bytes.push(c & 0xff)
+            }
+        }
+        return bytes
+    }
+    const key = stringToByte('{your secreat-key1}')
+    return sm4.decrypt(data, key)
+}
+
+```
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