1. If there is a yellow code in the health code, and the whole process of nucleic acid detection is done according to the relevant requirements, the risk of COVID-19 infection is eliminated, and the health will automatically turn green. If it doesn't turn green automatically, you can complain in the health code interface (just find the "yellow code transcoding application" column in the health code interface to operate). 2. If the transcoding conditions are met and the automatic transcoding fails, you can also register with the local community (village) and street (township) with relevant certificates to handle the matter of changing the yellow code to the green code. 3. If the yellow code distribution is found to be inaccurate, you can report to the community (village) for registration in time, and the community will summarize and review the transcoding step by step.