diff --git a/README.md b/README.md
index 21dcbde..0f7fe59 100644
--- a/README.md
+++ b/README.md
@@ -2,7 +2,7 @@
 以golib.gaore.com/GaoreGo/hertz_demo为模板的hertz框架脚手架
 
 #### 安装：
-    go install golib.gaore.com/GaoreGo/hertz_scaffold
+    go install golib.gaore.com/GaoreGo/hertz_scaffold@latest
 
 
 #### 命令行参数：
diff --git a/cmd/cmd.go b/cmd/cmd.go
index fe3758d..59d49eb 100644
--- a/cmd/cmd.go
+++ b/cmd/cmd.go
@@ -10,7 +10,7 @@ import (
 var (
 	template = "git@golib-ssh.gaore.com:GaoreGo/hertz_demo.git"
 	project  string
-	branch   = "master"
+	branch   string
 )
 
 var rootCmd = &cobra.Command{
diff --git a/cmd/create.go b/cmd/create.go
index 10bdb49..b834880 100644
--- a/cmd/create.go
+++ b/cmd/create.go
@@ -16,12 +16,11 @@ var createCmd = &cobra.Command{
 	},
 }
 
-func init() {
-	createCmd.Flags().StringVarP(&project, "project", "p", "", "项目名称")
-	createCmd.MarkFlagRequired("project")
-}
-
 func handleCreateCommand(args []string) {
+	if projectExists(project) {
+		log.Printf("Project %s already exists, use update", project)
+		os.Exit(1)
+	}
 	err := handleRemoteTemplate(template, branch, project)
 	if err != nil {
 		log.Printf("Error creating project: %s\n", err)
@@ -30,3 +29,16 @@ func handleCreateCommand(args []string) {
 	fmt.Printf("Project %s created successfully!\n", project)
 	return
 }
+
+func init() {
+	initFlags(createCmd)
+}
+
+// projectExists 检查项目路径是否已经存在
+func projectExists(projectPath string) bool {
+	info, err := os.Stat(projectPath)
+	if os.IsNotExist(err) {
+		return false
+	}
+	return info.IsDir()
+}
diff --git a/cmd/helpers.go b/cmd/helpers.go
index 00da69b..fe19dd6 100644
--- a/cmd/helpers.go
+++ b/cmd/helpers.go
@@ -1,7 +1,9 @@
 package cmd
 
 import (
+	"bytes"
 	"fmt"
+	"github.com/spf13/cobra"
 	"io"
 	"io/fs"
 	"log"
@@ -38,12 +40,13 @@ func handleRemoteTemplate(templateRepo, branch, projectPath string) (err error)
 	defer os.RemoveAll(tempDir)
 
 	// 克隆模板仓库
-	cloneCmd := exec.Command("git", "clone", "-b", branch, templateRepo, tempDir)
+	cloneCmd := exec.Command("git", "clone", "--branch", branch, templateRepo, tempDir)
 	cloneCmd.Stdout = io.Discard
-	cloneCmd.Stderr = os.Stderr
+	var stderr bytes.Buffer
+	cloneCmd.Stderr = &stderr
 
 	if err = cloneCmd.Run(); err != nil {
-		return fmt.Errorf("error cloning template repository: %s", err)
+		return fmt.Errorf("error cloning template repository: %s\n%s", err, extractError(stderr.String()))
 	}
 
 	return copyTemplate(tempDir, projectPath)
@@ -117,3 +120,23 @@ func copyAndReplaceFile(src, dist string, mode os.FileMode, replacements map[str
 	_, err = targetFile.WriteString(newContent)
 	return
 }
+
+// extractError 解析并提取实际的错误信息
+func extractError(stderr string) string {
+	lines := strings.Split(stderr, "\n")
+	var errorLines []string
+	for _, line := range lines {
+		// 过滤掉非错误信息
+		if strings.HasPrefix(line, "fatal:") || strings.Contains(line, "error:") {
+			errorLines = append(errorLines, line)
+		}
+	}
+	return strings.Join(errorLines, "\n")
+}
+
+// initFlags 初始化通用的命令行参数
+func initFlags(cmd *cobra.Command) {
+	cmd.Flags().StringVarP(&project, "project", "p", "", "项目名称")
+	cmd.Flags().StringVarP(&branch, "tag", "t", "master", "指定tag")
+	cmd.MarkFlagRequired("project")
+}
diff --git a/cmd/update.go b/cmd/update.go
index 64d5567..eb06ec7 100644
--- a/cmd/update.go
+++ b/cmd/update.go
@@ -3,6 +3,8 @@ package cmd
 import (
 	"fmt"
 	"github.com/spf13/cobra"
+	"log"
+	"os"
 )
 
 var updateCmd = &cobra.Command{
@@ -10,6 +12,20 @@ var updateCmd = &cobra.Command{
 	Short: "更新项目",
 	Long:  `Update the current project`,
 	Run: func(cmd *cobra.Command, args []string) {
-		fmt.Println("还没做")
+		handleUpdateCommand(args)
 	},
 }
+
+func init() {
+	initFlags(updateCmd)
+}
+
+func handleUpdateCommand(args []string) {
+	err := handleRemoteTemplate(template, branch, project)
+	if err != nil {
+		log.Printf("Error update project: %s\n", err)
+		os.Exit(1)
+	}
+	fmt.Printf("Project %s update successfully!\n", project)
+	return
+}