diff --git a/README.md b/README.md
index 1024770..36cfe66 100644
--- a/README.md
+++ b/README.md
@@ -8,6 +8,8 @@ go 实现 AES 加解密文件
 ``` cmd
 PS C:\Users\61778\Desktop> .\goED.exe --help
 Usage of C:\Users\61778\Desktop\goED.exe:
+  -key string
+        加密秘钥-限制大小写字母数字16位
   -mode string
         加密或者解密  en de (default "de")
   -outPath string
diff --git a/main.go b/main.go
index e85b9a5..c6ba715 100644
--- a/main.go
+++ b/main.go
@@ -69,6 +69,7 @@ func deFileToOutPath(path string, outPath string) {
 var mode = flag.String("mode", "de", "加密或者解密  en de")
 var path = flag.String("path", "", "文件路径")
 var outPath = flag.String("outPath", "", "指定输出文件路径")
+var key = flag.String("key", "", "加密秘钥-限制大小写字母数字16位 可以不指定")
 
 func main() {
 	flag.Parse()
@@ -79,6 +80,11 @@ func main() {
 	if len(*outPath) != 0 {
 		out = *outPath
 	}
+	if len(*key) == 16 {
+		util.InitBykey(*key)
+	} else if (len(*key) > 0) && (len(*key) < 16) {
+		fmt.Printf("秘钥限制大小写字母数字16位")
+	}
 	if len(*path) == 0 {
 		fmt.Printf("path 不能为空")
 	} else if *mode != "en" && *mode != "de" {
diff --git a/util/EncodeAndDecode.go b/util/EncodeAndDecode.go
index ad1b55e..bf9d986 100644
--- a/util/EncodeAndDecode.go
+++ b/util/EncodeAndDecode.go
@@ -26,6 +26,16 @@ func init() {
 	}
 }
 
+func InitBykey(key string) {
+	AesEcpt.key = []byte(key)
+	AesEcpt.iv = []byte("aebksHkG4jAEk2Ag")
+	var err error
+	AesEcpt.block, err = aes.NewCipher(AesEcpt.key)
+	if err != nil {
+		panic(err)
+	}
+}
+
 // 加密
 func (a *AesEncrypter) AesBase64Encrypt(in string) (string, error) {
 	origData := []byte(in)