diff --git a/.gitignore b/.gitignore
index c3c3463..26f8de6 100644
--- a/.gitignore
+++ b/.gitignore
@@ -4,4 +4,5 @@
 /*.log
 /autoLogin*
 /BitSrunLoginGo*
-/build
\ No newline at end of file
+/build
+/main*
\ No newline at end of file
diff --git a/internal/controllers/login.go b/internal/controllers/login.go
index 3e385bc..0586e65 100644
--- a/internal/controllers/login.go
+++ b/internal/controllers/login.go
@@ -27,9 +27,11 @@ func Login(eth *tools.Eth, debugOutput bool) error {
 		log.Debugln("开始嗅探 acid")
 		acid, e := srunClient.DetectAcid()
 		if e != nil {
-			log.Errorf("嗅探 acid 失败，使用配置 acid: %v", e)
-		} else if acid == "" {
-			log.Errorln("找不到 acid，使用配置 acid")
+			if e == srun.ErrAcidCannotFound {
+				log.Errorln("找不到 acid，使用配置 acid")
+			} else {
+				log.Errorf("嗅探 acid 失败，使用配置 acid: %v", e)
+			}
 		} else {
 			log.Debugf("使用嗅探 acid: %s", acid)
 			srunClient.LoginInfo.Meta.Acid = acid
diff --git a/pkg/srun/api.go b/pkg/srun/api.go
index c8dd91e..ff5b210 100644
--- a/pkg/srun/api.go
+++ b/pkg/srun/api.go
@@ -79,7 +79,6 @@ func (a *Api) GetUserInfo() (map[string]interface{}, error) {
 	return a.request("cgi-bin/rad_user_info", nil)
 }
 
-// DetectAcid error 为 nil 的情况下 acid 可能为空
 func (a *Api) DetectAcid() (string, error) {
 	addr := a.BaseUrl
 	for {
@@ -96,15 +95,22 @@ func (a *Api) DetectAcid() (string, error) {
 			} else {
 				addr = loc
 			}
+
+			var u *url.URL
+			u, e = url.Parse(addr)
+			if e != nil {
+				return "", e
+			}
+			acid := u.Query().Get(`ac_id`)
+			if acid != "" {
+				return acid, nil
+			}
+
 			continue
 		}
 		break
 	}
-	u, e := url.Parse(addr)
-	if e != nil {
-		return "", e
-	}
-	return u.Query().Get(`ac_id`), e
+	return "", ErrAcidCannotFound
 }
 
 func (a *Api) Login(
diff --git a/pkg/srun/errors.go b/pkg/srun/errors.go
index 77df90c..3f227ab 100644
--- a/pkg/srun/errors.go
+++ b/pkg/srun/errors.go
@@ -4,4 +4,5 @@ import "errors"
 
 var (
 	ErrResultCannotFound = errors.New("result cannot found from response")
+	ErrAcidCannotFound   = errors.New("acid not found")
 )