diff --git a/internal/router/ui.go b/internal/router/ui.go
index 99bcaf07..852f6b06 100644
--- a/internal/router/ui.go
+++ b/internal/router/ui.go
@@ -4,6 +4,7 @@ import (
 	"embed"
 	"fmt"
 	"io/fs"
+	"math/rand"
 	"net/http"
 	"os"
 
@@ -11,6 +12,7 @@ import (
 	"github.com/answerdev/answer/internal/base/handler"
 	"github.com/answerdev/answer/ui"
 	"github.com/gin-gonic/gin"
+	"github.com/segmentfault/pacman/errors"
 	"github.com/segmentfault/pacman/log"
 )
 
@@ -93,11 +95,29 @@ func (a *UIRouter) Register(r *gin.Engine) {
 	})
 
 	r.POST("/installation/db/check", func(c *gin.Context) {
-		handler.HandleResponse(c, nil, gin.H{})
+		num := rand.Intn(10)
+		if num > 5 {
+			err := errors.BadRequest("connection error")
+			handler.HandleResponse(c, err, gin.H{})
+		} else {
+			handler.HandleResponse(c, nil, gin.H{
+				"connection_success": true,
+			})
+		}
 	})
 
 	r.POST("/installation/config-file/check", func(c *gin.Context) {
-		handler.HandleResponse(c, nil, gin.H{})
+		num := rand.Intn(10)
+		if num > 5 {
+			handler.HandleResponse(c, nil, gin.H{
+				"exist": true,
+			})
+		} else {
+			handler.HandleResponse(c, nil, gin.H{
+				"exist": false,
+			})
+		}
+
 	})
 
 	r.POST("/installation/init", func(c *gin.Context) {