Counties and cities that implement the policy of developing the western region. The overall thinning project of education science and technology is mainly concentrated in four contiguous poverty-stricken areas, "Shen Xi" areas and key counties in the old revolutionary base areas. Shen Xi refers to the counties, cities and districts that implement the policy of developing the western region, and the western region refers to Sichuan, Chongqing, Shaanxi, Gansu, Qinghai, Ningxia and Xinjiang. Region, a kind of chinese administrative division, is the same as the administrative divisions of prefecture-level cities, autonomous prefectures and leagues, and it is a regional administrative region under the jurisdiction of provinces and autonomous regions.