The New Crown mRNA vaccine is a type of New Crown vaccine that usually requires two shots. The mRNA vaccine is mainly injected by intramuscular means and is given twice, with an interval of 28 days between the two vaccinations. After vaccination, there may be redness, swelling, pain at the site of vaccination, body fever, malaise and other adverse reactions. It is prohibited to use in patients who are allergic to any of the components of the product, or who have a history of severe allergy, immunocompromised, people under 12 years of age, pregnant women and nursing mothers, patients receiving immunosuppressive therapy; patients suffering from acute diseases or severe chronic diseases, or during the exacerbation period of chronic diseases, and patients with fever. It should be used under the guidance of a doctor according to the individual’s physical condition.