To enter China from abroad, the latest regulations could be found on the website of the local embassy of the People’s  Republic of China, including the requirement for the COVID-19 test, self-quarantine, and so on. 

To enter Hangzhou from abroad,  there are “14+7+7” health management measures, that is, first implement 14 days of centralized isolation medical observation, continue to implement 7 days of home health observation, and then implement 7 days of daily health monitoring. The latest regulation could be found here.