diff --git a/src/global.d.ts b/src/global.d.ts
index ec27446..6e464e5 100644
--- a/src/global.d.ts
+++ b/src/global.d.ts
@@ -7,7 +7,7 @@ declare global {
   // const Cesium: Cesium
   // 允许扩展 Window
   interface Window {
-    cesium: Cesium
+    Cesium: Cesium
     CESIUM_BASE_URL: string
     viewer: Viewer
   }
diff --git a/src/utils/map/TDTProvider.ts b/src/utils/map/TDTProvider.ts
index a5cfd82..c7baacb 100644
--- a/src/utils/map/TDTProvider.ts
+++ b/src/utils/map/TDTProvider.ts
@@ -88,7 +88,7 @@ export function getTDTTerrainProvider() {
     terrainUrls.push(url)
   }
 
-  const provider = new Cesium.GeoTerrainProvider({
+  const provider = new window.Cesium.GeoTerrainProvider({
     urls: terrainUrls,
   })
   return provider