diff --git a/internal/service/avatar_service.go b/internal/service/avatar_service.go
index 043fdbd..2a6bb15 100644
--- a/internal/service/avatar_service.go
+++ b/internal/service/avatar_service.go
@@ -67,8 +67,14 @@ func (s *AvatarService) ProcessAvatar(userID uint, file io.Reader, contentType s
 		return "", fmt.Errorf("文件大小不能超过 5MB")
 	}
 
-	// 3. 解码图片
-	img, _, err := image.Decode(bytes.NewReader(data))
+	// 3. 解码图片（WebP 需显式调用 webp.Decode，Go 标准库不含 WebP 解码器）
+	var img image.Image
+	switch contentType {
+	case "image/webp":
+		img, err = webp.Decode(bytes.NewReader(data))
+	default:
+		img, _, err = image.Decode(bytes.NewReader(data))
+	}
 	if err != nil {
 		return "", fmt.Errorf("图片解码失败：%v", err)
 	}