At present, low-risk areas in China only need a healthy green code to sink back. For those who return from high-risk areas in China, centralized isolation medical observation should be strictly carried out for 14 days, and the isolation period after return is 14 days, during which nucleic acid detection should be carried out as required; If you are returning from a low-risk area in China, you only need to hold the green health code at present. For those returning from the epidemic area, it is also recommended to provide negative proof of COVID-19 nucleic acid test within 7 days. If you can't provide negative proof of nucleic acid testing, you need to accept nucleic acid testing at the first time. Generally speaking, "nucleic acid detection+health code+password" is the most basic condition.