According to relevant information, it is necessary to isolate from Changchun to Wafangdian. Because Changchun has a high-risk area, it needs to be isolated from Wafangdian for 7 days. Changchun, formerly known as Xi Du and Chachong, is a prefecture-level city, provincial capital and sub-provincial city under the jurisdiction of Jilin Province and the core city of Harbin-Changzhou urban agglomeration. It is one of the central cities and important industrial bases in Northeast China approved by the State Council.