Should Shangrao be isolated from Changshan?

No need. According to official website of China Center for Epidemic Prevention and Control, as of September 2 1 day, 2022, Shangrao City has no confirmed cases of COVID-19, which belongs to the normalized management area, and Changshan County has no confirmed cases of COVID-19, which belongs to the normalized management area. There is no need to isolate the two places, just bring 48 hours of nucleic acid test results, show the hygiene code and wear a mask.