diff --git a/backend/cmd/main.go b/backend/cmd/main.go
index c0f3b5e..8984b33 100644
--- a/backend/cmd/main.go
+++ b/backend/cmd/main.go
@@ -233,7 +233,7 @@ func startServer() {
 
 	r.Use(func(c *gin.Context) {
 		if strings.HasPrefix(c.Request.URL.Path, "/uploads/") {
-			c.Header("Cache-Control", "public, max-age=3600")
+			c.Header("Cache-Control", "public, max-age=31536000, immutable")
 		}
 		c.Next()
 	})
diff --git a/backend/internal/router/admin/system_settings.go b/backend/internal/router/admin/system_settings.go
index 2b8a0ba..aa1d23d 100644
--- a/backend/internal/router/admin/system_settings.go
+++ b/backend/internal/router/admin/system_settings.go
@@ -382,6 +382,12 @@ func handleUploadSystemImage(c *gin.Context) {
 		return
 	}
 
+	pattern := filepath.Join(uploadDir, uploadType+"_*")
+	oldFiles, _ := filepath.Glob(pattern)
+	for _, oldFile := range oldFiles {
+		os.Remove(oldFile)
+	}
+
 	filename := fmt.Sprintf("%s_%d%s", uploadType, time.Now().UnixNano(), ext)
 	filePath := filepath.Join(uploadDir, filename)