diff --git a/controllers/controller.go b/controllers/controller.go
index 982a479..1252f8b 100644
--- a/controllers/controller.go
+++ b/controllers/controller.go
@@ -94,8 +94,8 @@ func callFunc(c *gin.Context, worker func() (retVal interface{}, errCode string,
 
 func captchaVerify(c *gin.Context, code string) bool {
 	session := sessions.Default(c)
-	if captchaId := session.Get(c.ClientIP() + model.SessionKey); captchaId != nil {
-		session.Delete(c.ClientIP() + model.SessionKey)
+	if captchaId := session.Get(model.SessionKey); captchaId != nil {
+		session.Delete(model.SessionKey)
 		_ = session.Save()
 		if captcha.VerifyString(captchaId.(string), code) {
 			return true
diff --git a/utils/utils.go b/utils/utils.go
index 90cda62..c8cb232 100644
--- a/utils/utils.go
+++ b/utils/utils.go
@@ -65,7 +65,7 @@ func Captcha(c *gin.Context, length ...int) {
 	}
 	captchaId := captcha.NewLen(l)
 	session := sessions.Default(c)
-	session.Set(c.ClientIP()+model.SessionKey, captchaId)
+	session.Set(model.SessionKey, captchaId)
 	_ = session.Save()
 	_ = Serve(c.Writer, c.Request, captchaId, ".png", "zh", false, w, h)
 }