diff --git a/screensaver/scconfiguration.cpp b/screensaver/scconfiguration.cpp
index 9232138..2166381 100644
--- a/screensaver/scconfiguration.cpp
+++ b/screensaver/scconfiguration.cpp
@@ -147,19 +147,24 @@ QString SCConfiguration::getDefaultBackground()
     if(ispicture(backgroundFile)) {
         return backgroundFile;
     } else {
+        QString defaultBackground;
 #ifdef KDKINFO_FOUND
-        char *systemName = kdk_system_get_systemName();
-#else
-	char *systemName = "none";
-#endif
+        char *systemName = nullptr; // 初始化为 nullptr
+        systemName = kdk_system_get_systemName();
         if (systemName) {
             if (QString(systemName) == "openKylin") {
-                free(systemName);
-                return "/usr/share/backgrounds/1-openkylin.jpg";
+                defaultBackground = "/usr/share/backgrounds/1-openkylin.jpg";
+            } else {
+                defaultBackground = "/usr/share/backgrounds/1-warty-final-ubuntukylin.jpg";
             }
-            free(systemName);
+        } else {
+            defaultBackground = "/usr/share/backgrounds/1-warty-final-ubuntukylin.jpg";
         }
-        return "/usr/share/backgrounds/1-warty-final-ubuntukylin.jpg";
+        free(systemName);
+#else
+        defaultBackground = "/usr/share/backgrounds/1-openkylin.jpg";
+#endif
+        return defaultBackground;
     }
 }