In general, it is not possible to improve immunity quickly through diet alone. Reasonable nutrition can maintain the normal function of the body’s immune organs, and lack of nutrition will lead to impaired immune function, making immunity decline. The improvement of human immunity is a long-term process, scientific diet, balanced nutrition, reasonable diet structure, the whole day food including cereals, vegetables, fruits, meat, milk, beans, as well as the appropriate amount of oil, salt, etc., vitamin-rich vegetables and fruits, as well as protein-rich meat, eggs and milk can increase the intake. It is also important to pay attention to appropriate exercise, such as swimming, weight lifting, push-ups, etc., to improve physical fitness and strengthen the body, thus contributing to the improvement of immunity. The more commonly used clinical drugs to improve immunity quickly are thymidine, transfer factor, etc. These drugs should not be used by themselves, but must be taken under the guidance of a doctor. Immunity-boosting drugs are actually immunomodulators that can effectively enhance the immune function of the body and are usually used for tumor patients, patients with severe infections, and groups with immune deficiencies. In case of seasonal immune deficiency, vaccination is also available to prevent viral attack.