If you want to ask about health regulations.
Need a health code. If it is a nucleic acid test report, different provinces and cities have different requirements for nucleic acid testing of provincial personnel. Generally, people in low-risk areas will not be required to provide negative proof of nucleic acid test as long as they have green health code, take high-speed rail, bus or travel by themselves across provinces. However, when traveling across provinces, people in high-risk areas need to show negative proof of nucleic acid test within 48 hours and green code of health code.