The New Crown vaccine available in China has undergone rigorous clinical testing, and there is no information showing that there are clear sequelae after New Crown vaccination, but there may be some adverse reactions, and the third dose of the New Crown vaccine is usually no different from the adverse reactions of other injections. Adverse reactions to the third dose of the new crown vaccine include systemic reactions and local reactions, and abnormal adverse reactions are mostly syncope or anaphylactic shock. General adverse reactions such as redness and swelling at the vaccination site, headache, fatigue, nausea, etc. usually do not require special treatment and will resolve on their own in 2~3 days. For abnormal adverse reactions such as syncope or anaphylactic shock, i.e., sudden drop in blood pressure, dizziness, pallor, lightheadedness or even respiratory distress after vaccination, immediate treatment should be provided in a hospital. After vaccination, it is recommended to stay for 30 minutes as required to observe the reaction to the vaccination. Before and after the vaccination, the vaccinee should pay attention to rest and keep the skin of the wound dry and clean in order to minimize the probability of adverse reactions.