diff --git a/errno/default.go b/errno/default.go
index e2b9ef6..0dfeca5 100644
--- a/errno/default.go
+++ b/errno/default.go
@@ -26,11 +26,10 @@ var (
 	AuthorizationFailedError = NewErrNo(AuthorizationFailedErrCode, "authorization failed")
 
 	// User
-	AccountConflictError     = NewErrNo(AuthorizationFailedErrCode, "account conflict")
-	IdentifierExpiredError   = NewErrNo(AuthorizationFailedErrCode, "session expired")
-	LoginCheckFailedError    = NewErrNo(AuthorizationFailedErrCode, "login check failed")
-	SSOLoginFailedError      = NewErrNo(AuthorizationFailedErrCode, "sso login failed")
-	GetIdentifierFailedError = NewErrNo(AuthorizationFailedErrCode, "get session failed")
+	AccountConflictError  = NewErrNo(AuthorizationFailedErrCode, "account conflict")
+	CookieError           = NewErrNo(AuthorizationFailedErrCode, "id error or session expired")
+	LoginCheckFailedError = NewErrNo(AuthorizationFailedErrCode, "login check failed")
+	SSOLoginFailedError   = NewErrNo(AuthorizationFailedErrCode, "sso login failed")
 
 	// HTTP
 	HTTPQueryError = NewErrNo(HTTPQueryErrorCode, "HTTP query failed")
diff --git a/jwch.go b/jwch.go
index 70ed3c3..f8ec58f 100644
--- a/jwch.go
+++ b/jwch.go
@@ -78,13 +78,14 @@ func (s *Student) NewRequest() *resty.Request {
 
 func (s *Student) GetWithIdentifier(url string) (*html.Node, error) {
 	resp, err := s.NewRequest().SetHeader("Referer", constants.JwchReferer).SetQueryParam("id", s.Identifier).Get(url)
+	// 会话过期：会直接重定向，但我们禁用了重定向，所以会有error
 	if err != nil {
-		return nil, errno.IdentifierExpiredError.WithErr(err)
+		return nil, errno.CookieError
 	}
 
-	// 会话过期 TODO: 判断条件有点简陋
+	// 还有一种情况是 id 或 cookie 缺失或者解析错误 TODO: 判断条件有点简陋
 	if strings.Contains(string(resp.Body()), "重新登录") {
-		return nil, errno.IdentifierExpiredError
+		return nil, errno.CookieError
 	}
 
 	return htmlquery.Parse(bytes.NewReader(resp.Body()))
@@ -95,14 +96,14 @@ func (s *Student) PostWithIdentifier(url string, formData map[string]string) (*h
 	resp, err := s.NewRequest().SetHeader("Referer", constants.JwchReferer).SetQueryParam("id", s.Identifier).SetFormData(formData).Post(url)
 
 	s.NewRequest().EnableTrace()
-
+	// 会话过期：会直接重定向，但我们禁用了重定向，所以会有error
 	if err != nil {
-		return nil, errno.IdentifierExpiredError.WithErr(err)
+		return nil, errno.CookieError.WithErr(err)
 	}
 
-	// Identifier缺失 TODO: 判断条件有点简陋
+	// id 或 cookie 缺失或者解析错误 TODO: 判断条件有点简陋
 	if strings.Contains(string(resp.Body()), "处理URL失败") {
-		return nil, errno.IdentifierExpiredError
+		return nil, errno.CookieError
 	}
 
 	return htmlquery.Parse(strings.NewReader(strings.TrimSpace(string(resp.Body()))))
diff --git a/user.go b/user.go
index eff6382..eb7f6f3 100644
--- a/user.go
+++ b/user.go
@@ -127,13 +127,13 @@ func (s *Student) Login() error {
 
 	// 这里是err == nil 因为禁止了重定向，正常登录是会出现异常的
 	if err == nil {
-		return errno.GetIdentifierFailedError
+		return errno.CookieError
 	}
 
 	data := regexp.MustCompile(`id=(.*?)&`).FindStringSubmatch(err.Error())
 
 	if len(data) < 1 {
-		return errno.GetIdentifierFailedError
+		return errno.CookieError
 	}
 
 	s.SetIdentifier(data[1])
@@ -167,7 +167,7 @@ func (s *Student) CheckSession() error {
 	res := htmlquery.FindOne(resp, `//*[@id="ContentPlaceHolder1_LB_xh"]`)
 
 	if res == nil {
-		return errno.IdentifierExpiredError.WithErr(err)
+		return errno.CookieError
 	}
 
 	if htmlquery.OutputHTML(res, false) != s.ID {