The third booster vaccine is given 6 months after the first two doses of the New Crown vaccine have been fully immunized. The third booster vaccine is a catch-up vaccination after two full doses of inactivated vaccine. The main purpose is to increase the effectiveness of the vaccine in preventing infection with the New Crown virus. Six months after receiving the inactivated vaccine, the body’s antibody level will gradually decrease, and then a booster vaccination is needed six months after the full vaccination. After the third booster injection, the antibody level will rise significantly within a short period of time, thus providing protection. Before vaccination, you should inform your doctor about your health condition and follow the doctor’s instructions to complete the vaccination. Observe the patient for 30 minutes after the vaccination and leave the room when there is no discomfort.