diff --git a/README.md b/README.md
index 8646224..51e48f6 100644
--- a/README.md
+++ b/README.md
@@ -63,6 +63,10 @@ You can make customization by editing `config.json`
   - type: `string`
   - default: `''`
 
+- `authkeyExpiredTimeout`
+  - type: `int64`
+  - default: `30`
+
 - `tempDir`
   - type: `string`
   - default: `./temp`
diff --git a/README_zh.md b/README_zh.md
index 0b1122f..95c09ac 100644
--- a/README_zh.md
+++ b/README_zh.md
@@ -64,6 +64,10 @@ clipboard-online 是一款可以帮你在 💻Windows 和 📱iOS 之间分享
   - type: `string`
   - default: `''`
 
+- `authkeyExpiredTimeout`
+  - type: `int64`
+  - default: `30`
+
 - `tempDir`
   - type: `string`
   - default: `./temp`
diff --git a/config.go b/config.go
index 8d23db4..cae8adf 100644
--- a/config.go
+++ b/config.go
@@ -13,12 +13,13 @@ const LogFile = "log.txt"
 
 // Config represents configuration for applicaton
 type Config struct {
-	Port           string       `json:"port"`
-	Authkey        string       `json:"authkey"`
-	LogLevel       log.Level    `json:"logLevel"`
-	TempDir        string       `json:"tempDir"`
-	ReserveHistory bool         `json:"reserveHistory"`
-	Notify         ConfigNotify `json:"notify"`
+	Port                  string       `json:"port"`
+	Authkey               string       `json:"authkey"`
+	AuthkeyExpiredTimeout int64        `json:"authkeyExpiredTimeout"`
+	LogLevel              log.Level    `json:"logLevel"`
+	TempDir               string       `json:"tempDir"`
+	ReserveHistory        bool         `json:"reserveHistory"`
+	Notify                ConfigNotify `json:"notify"`
 }
 
 type ConfigNotify struct {
@@ -28,11 +29,12 @@ type ConfigNotify struct {
 
 // DefaultConfig is a default configuration for application
 var DefaultConfig = Config{
-	Port:           "8086",
-	Authkey:        "",
-	LogLevel:       log.WarnLevel,
-	TempDir:        "./temp",
-	ReserveHistory: false,
+	Port:                  "8086",
+	Authkey:               "",
+	AuthkeyExpiredTimeout: 30,
+	LogLevel:              log.WarnLevel,
+	TempDir:               "./temp",
+	ReserveHistory:        false,
 	Notify: ConfigNotify{
 		Copy:  false,
 		Paste: false,
diff --git a/server.go b/server.go
index a3c7152..4ba35cb 100644
--- a/server.go
+++ b/server.go
@@ -26,8 +26,7 @@ import (
 )
 
 const (
-	apiVersion                 = "1"
-	authAvailableTimeout int64 = 30
+	apiVersion = "1"
 )
 
 func setupRoute(engin *gin.Engine) {
@@ -81,7 +80,7 @@ func auth() gin.HandlerFunc {
 		reqAuth := c.GetHeader("X-Auth")
 
 		timestamp := time.Now().Unix()
-		timeKey := timestamp / authAvailableTimeout
+		timeKey := timestamp / app.config.AuthkeyExpiredTimeout
 
 		authCodeRaw := app.config.Authkey + "." + strconv.FormatInt(timeKey, 10)
 		authCodeHash := md5.Sum([]byte(authCodeRaw))