diff --git a/src/main/java/com/gameplatform/server/service/admin/SystemConfigService.java b/src/main/java/com/gameplatform/server/service/admin/SystemConfigService.java
index d807381..57c3e56 100644
--- a/src/main/java/com/gameplatform/server/service/admin/SystemConfigService.java
+++ b/src/main/java/com/gameplatform/server/service/admin/SystemConfigService.java
@@ -133,6 +133,7 @@ public class SystemConfigService {
                 SystemConfig existing = systemConfigMapper.findByKey(config.getConfigKey());
                 if (existing != null) {
                     config.setId(existing.getId());
+                    config.setIsSystem(existing.getIsSystem()); // 保留原有的 isSystem 值
                     if (systemConfigMapper.update(config) > 0) {
                         successCount++;
                     }