Introduction to Chengxi: Chengxi District refers to the Qinghai provincial capital, one of the districts of Xining City. In the south-central part of Xining, the upper reaches of the Qinshui River is a modern urban area with scientific research, culture, education and commerce as the main body. Chengxi District is in the west of Xining City, with 7323 hectares. The population is 293,400 (2007). The area is dominated by the Han nationality, as well as 26 ethnic minorities such as Hui, Tibet and Tu. It is in the Surabaya Valley, low in the south and low in the north. The Minshui River and the Nanchuan River meet. The annual average temperature is 4.9 °C, and the annual precipitation is 379 mm.