diff --git a/routers/static_filter.go b/routers/static_filter.go
index 240a25b4..9fed9aa2 100644
--- a/routers/static_filter.go
+++ b/routers/static_filter.go
@@ -26,6 +26,7 @@ import (
 
 	"github.com/beego/beego/context"
 	"github.com/casdoor/casdoor/conf"
+	"github.com/casdoor/casdoor/object"
 	"github.com/casdoor/casdoor/util"
 )
 
@@ -46,6 +47,46 @@ func getWebBuildFolder() string {
 	return path
 }
 
+func fastAutoSignin(ctx *context.Context) (string, error) {
+	userId := getSessionUser(ctx)
+	if userId == "" {
+		return "", nil
+	}
+
+	clientId := ctx.Input.Query("client_id")
+	responseType := ctx.Input.Query("response_type")
+	redirectUri := ctx.Input.Query("redirect_uri")
+	scope := ctx.Input.Query("scope")
+	state := ctx.Input.Query("state")
+	nonce := ""
+	codeChallenge := ""
+	if clientId == "" || responseType != "code" || redirectUri == "" {
+		return "", nil
+	}
+
+	application, err := object.GetApplicationByClientId(clientId)
+	if err != nil {
+		return "", err
+	}
+	if application == nil {
+		return "", nil
+	}
+
+	if !application.EnableAutoSignin {
+		return "", nil
+	}
+
+	code, err := object.GetOAuthCode(userId, clientId, responseType, redirectUri, scope, state, nonce, codeChallenge, ctx.Request.Host, getAcceptLanguage(ctx))
+	if err != nil {
+		return "", err
+	} else if code.Message != "" {
+		return "", fmt.Errorf(code.Message)
+	}
+
+	res := fmt.Sprintf("%s?code=%s&state=%s", redirectUri, code.Code, state)
+	return res, nil
+}
+
 func StaticFilter(ctx *context.Context) {
 	urlPath := ctx.Request.URL.Path
 
@@ -63,6 +104,19 @@ func StaticFilter(ctx *context.Context) {
 		return
 	}
 
+	if urlPath == "/login/oauth/authorize" {
+		redirectUrl, err := fastAutoSignin(ctx)
+		if err != nil {
+			responseError(ctx, err.Error())
+			return
+		}
+
+		if redirectUrl != "" {
+			http.Redirect(ctx.ResponseWriter, ctx.Request, redirectUrl, http.StatusFound)
+			return
+		}
+	}
+
 	webBuildFolder := getWebBuildFolder()
 	path := webBuildFolder
 	if urlPath == "/" {