@zhaoyisong Unfortunately Tianditu won’t load on my end (I believe it’s only accessible to Chinese users), but I’m fairly sure the process here is adding a “Cesium Web Map Tile Service Raster Overlay” to your tileset and setting the URL to http://t0.tianditu.gov.cn/img_w/wmts. I think Tianditu requires a token in the URL, so the URL will probably need to be http://t0.tianditu.gov.cn/img_w/wmts?tk=<your token here>, putting in the token you have to access Tianditu in place of <your token here>.