Qilihe District, Lanzhou City. According to the official website of Lanzhou Municipal People's Government, Huaxi Subsidiary of Lanzhou Nuclear Power Company undertakes the nucleic acid detection in Qilihe District of Lanzhou City. Lanzhou, located in the middle of Gansu Province, is the political, economic, cultural and commercial center of Gansu Province, as well as the transportation hub and passenger distribution center in northwest China.