The health code of the booster will show that after vaccination with COVID-19 vaccine booster, you can query the vaccination information through the health code on your mobile phone. Generally, it needs to be displayed within two to three days after vaccination with COVID-19 vaccine booster. According to the registration system of each region, in some places, it may be displayed one day after vaccination with COVID-19 vaccine booster. In some places, it may be slow, which was shown after a week of vaccination in COVID-19.