Once you scan the health code software with your mobile phone, it will immediately retrieve your mobile phone usage, vehicle usage and code scanning shopping, get your action trajectory and activity area some time ago, and then look at the coincidence degree of your action trajectory and activity area with confirmed cases or suspected cases, so as to judge whether you have been exposed to confirmed cases or suspected cases.
Then, your personal health code will be given. There are three possible colors:
Green code: you can pass.
Code yellow: quarantine for 7 days. For 7 consecutive days, the health punch card was normal and turned into a green code.
Red team: quarantine 14 days. For 14 days, the health clock is normal and turns into a green code.