It is generally recommended that the New Crown vaccine be administered about three days after the symptoms of the cold have subsided and the medication has been stopped. Because the immune function is low during cold and flu, plus taking some cold medications, it is easy to cause adverse reactions after vaccination with New Crown vaccine. Before vaccination, you need to know about the new crown disease, the new crown vaccine and the vaccination process in advance. When receiving the vaccination, you need to bring your personal documents, do your personal protection work according to the requirements, cooperate with the on-site vaccination staff and provide information about your health status and contraindications to vaccination truthfully. After vaccination, you need to stay for 30 minutes to keep the skin clean and avoid scratching the vaccination site with your hands. In case of suspected adverse reactions, report to the doctor immediately; common adverse reactions after vaccination with the new crown vaccine are redness, swelling, hard nodules and pain at the vaccination site, etc. Clinical manifestations such as fever, weakness, nausea, headache and muscle aches may also occur. There are also a few people who may experience acute allergic reactions and fainting, which need to be handled rationally. Serious acute allergic reactions mostly occur within 30 minutes after vaccination, so the rule of staying for 30 minutes after vaccination with New Crown vaccine should be strictly observed.