diff --git a/GISDlg.cpp b/GISDlg.cpp
index 5f44ebd..1e99b29 100644
--- a/GISDlg.cpp
+++ b/GISDlg.cpp
@@ -689,7 +689,6 @@ void CGISDlg::AddTianDiTuService()
 
 	mapWindow::ITiles* pTiles = m_map.GetTiles();
 	mapWindow::ITileProvidersPtr providers = pTiles->GetProviders();
-
 	//pTiles->ClearCache(mapWindow::tkCacheType::Disk);//清除磁盘Tiles缓存
 	//int providerId = (int)mapWindow::tkTileProvider::ProviderCustom + 1;    // (1024 + 1) should be unique across application runs in case disk caching is used
 	int providerId = mapWindow::tkTileProvider::ProviderCustom;
@@ -699,7 +698,7 @@ void CGISDlg::AddTianDiTuService()
 		(baseurl+key).c_str(),//(_bstr_t)url.c_str(),
 		mapWindow::tkTileProjection::SphericalMercator, 0, 18);//,"TianDiTu,All Rights Reserved"
 
-	m_map.put_ZoomBarMaxZoom(18);//设置缩放条最大18级
+	m_map.put_ZoomBarMaxZoom(20);//设置缩放条最大20级
 	//pTiles->ProviderId = providerId; //激活当前服务
 	//Tile缓存设置
 	//pTiles->put_UseCache(mapWindow::tkCacheType::Disk,true);//默认情况下处于打开状态