diff --git a/handler/xibao/xibao.go b/handler/xibao/xibao.go
index 638ceaf..c995211 100644
--- a/handler/xibao/xibao.go
+++ b/handler/xibao/xibao.go
@@ -82,7 +82,7 @@ func beiBao(msg model.Message) (reply *model.Reply) {
 	imageMsg := message.ImageMessage{
 		Type: "image",
 		Data: message.ImageMessageData{
-			File: "file:///tmp/qqbot/" + fileName + ".png",
+			File: "file://" + filePath,
 		},
 	}
 	return &model.Reply{
@@ -100,7 +100,7 @@ func beiBaoTemp(msg model.Message) (reply *model.Reply, isTrigger bool) {
 	imageMsg := message.ImageMessage{
 		Type: "image",
 		Data: message.ImageMessageData{
-			File: "file:///tmp/qqbot/" + fileName + ".png",
+			File: "file://" + filePath,
 		},
 	}
 	return &model.Reply{
diff --git a/service/xibao/image_gen.go b/service/xibao/image_gen.go
index 4af84b5..604c2ec 100644
--- a/service/xibao/image_gen.go
+++ b/service/xibao/image_gen.go
@@ -8,7 +8,6 @@ import (
 	"git.lxtend.com/qqbot/message"
 	"git.lxtend.com/qqbot/util"
 	"github.com/fogleman/gg"
-	"github.com/google/uuid"
 	"golang.org/x/image/font/opentype"
 )
 
@@ -29,10 +28,8 @@ func GenerateCongratulationImage(text string, inputFile, outputFile string, isGo
 	dc.DrawImage(im, 0, 0)
 	// 判断是否为图片
 	if imgUrl, ok := isImageCQ(text); ok {
-		fileName := uuid.New().String() + ".jpg"
-		filePath := "./tmp/" + fileName
-
-		if err := util.DownloadFile(imgUrl, filePath); err != nil {
+		filePath, err := util.DownloadFile(imgUrl, "/tmp")
+		if err != nil {
 			log.Print("无法下载图片:", err)
 			return
 		}
diff --git a/util/url.go b/util/url.go
index 73220e5..4ddb502 100644
--- a/util/url.go
+++ b/util/url.go
@@ -1,14 +1,41 @@
 package util
 
 import (
+	"bytes"
 	"fmt"
 	"io"
 	"net/http"
 	"net/url"
 	"os"
+	"path"
 	"strings"
+
+	"github.com/google/uuid"
 )
 
+// GetImageExtension 根据文件头检测图片格式并返回对应的扩展名
+func GetImageExtension(data []byte) string {
+	if len(data) < 8 {
+		return ".jpg" // 默认返回jpg
+	}
+
+	// 检查文件头（Magic Numbers）
+	switch {
+	case bytes.HasPrefix(data, []byte{0x89, 0x50, 0x4E, 0x47}):
+		return ".png"
+	case bytes.HasPrefix(data, []byte{0xFF, 0xD8, 0xFF}):
+		return ".jpg"
+	case bytes.HasPrefix(data, []byte{0x47, 0x49, 0x46}):
+		return ".gif"
+	case bytes.HasPrefix(data, []byte{0x42, 0x4D}):
+		return ".bmp"
+	case bytes.HasPrefix(data, []byte{0x52, 0x49, 0x46, 0x46}) && bytes.Contains(data[0:12], []byte("WEBP")):
+		return ".webp"
+	default:
+		return ".jpg" // 默认返回jpg
+	}
+}
+
 // isEquivalentURL 判断两个 URL 是否在规范化后相同
 func IsEquivalentURL(url1, url2 string) bool {
 	norm1 := normalizeURL(url1)
@@ -36,9 +63,9 @@ func normalizeURL(rawURL string) string {
 	return u.String()
 }
 
-func DownloadFile(url string, filepath string) (err error) {
+// DownloadFile 下载文件到指定目录，返回带有正确扩展名的完整文件路径
+func DownloadFile(url string, dirPath string) (filepath string, err error) {
 	// 发送 HTTP GET 请求
-	// resp, err := http.Get(url)
 	var resp *http.Response
 	var maxRetry = 100
 	var retry = 0
@@ -47,27 +74,47 @@ func DownloadFile(url string, filepath string) (err error) {
 		retry++
 	}
 	if err != nil {
-		return fmt.Errorf("下载失败: %v", err)
+		return "", fmt.Errorf("下载失败: %v", err)
 	}
 	defer resp.Body.Close()
 
 	// 检查 HTTP 响应状态码
 	if resp.StatusCode != http.StatusOK {
-		return fmt.Errorf("请求失败，状态码: %d", resp.StatusCode)
+		return "", fmt.Errorf("请求失败，状态码: %d", resp.StatusCode)
 	}
 
+	// 读取响应内容到内存中以检测文件类型
+	bodyData, err := io.ReadAll(resp.Body)
+	if err != nil {
+		return "", fmt.Errorf("读取响应内容失败: %v", err)
+	}
+
+	// 获取正确的文件扩展名
+	ext := GetImageExtension(bodyData)
+
+	// 生成随机文件名
+	fileName := uuid.New().String() + ext
+
+	// 确保目录存在
+	if err := os.MkdirAll(dirPath, 0755); err != nil {
+		return "", fmt.Errorf("创建目录失败: %v", err)
+	}
+
+	// 构建完整的文件路径
+	filepath = path.Join(dirPath, fileName)
+
 	// 创建文件
 	out, err := os.Create(filepath)
 	if err != nil {
-		return fmt.Errorf("创建文件失败: %v", err)
+		return "", fmt.Errorf("创建文件失败: %v", err)
 	}
 	defer out.Close()
 
-	// 将响应的内容复制到文件
-	_, err = io.Copy(out, resp.Body)
+	// 将内容写入文件
+	_, err = io.Copy(out, bytes.NewReader(bodyData))
 	if err != nil {
-		return fmt.Errorf("保存失败: %v", err)
+		return "", fmt.Errorf("保存失败: %v", err)
 	}
 
-	return nil
+	return filepath, nil
 }