After the nucleic acid test, the health code will return to the green code after multiple negative nucleic acid tests. In general, the color of health code is green, and the yellow code of health code plays a warning role. After the yellow code of health code appears, you should go to the hospital or testing institution for nucleic acid testing immediately. After many negative nucleic acid tests, the health code will return to the green code. If the health codes of the two provinces are inconsistent due to abnormal reasons, you can contact the staff to make a complaint.