Chongqing is located in the southwestern inland China. It is the economic, financial, technological innovation, shipping and commercial logistics center in the upper reaches of the Yangtze River , a national logistics hub [4] , an important strategic fulcrum for the western development , the " Belt and Road " and the Yangtze River Economic Belt Important connection points and inland open highlands, beautiful places with beautiful mountains and clear waters; [5] It is not only famous for river cities , fog cities , and bridges , but also famous for mountain cities. [6] Chongqing is dominated by the Han nationality, and the main minorities include the Tujia and Miao nationalities . There are abundant tourism resources, including the Three Gorges of the Yangtze River, the World Cultural Heritage Dazu Rock Carvings , the World Natural Heritage Wulong Karst and Nanchuan Jinfo Mountain . [7]