There is no such thing as the fastest and most effective way to improve immunity. Methods to improve immunity include human immunoglobulin injections, vaccinations and lifestyle adjustments. 1. Injection of human immunoglobulin: Immunoglobulin is a protein with antibody activity, divided into five types: lgA, lgG, lgM, lgD and lgE, which are involved in different immune processes in the human body. Therefore, the injection of immunoglobulin can improve the immunity of the patient in a short period of time, and enhance the ability of the body to fight infections and the function of immunoregulation. 2. Vaccination: Vaccines are divided into artificial active immunization preparations and artificial passive immunization preparations, and vaccination can increase the patient’s body’s disease-resistant ability actively or passively, such as hepatitis B vaccine, polio vaccine, encephalitis B vaccine, measles vaccine and so on. 3. Lifestyle adjustment: Regular work and rest, light diet, eating more vegetables and fruits, increasing the amount of exercise and other lifestyle adjustments can enhance the patient’s immunity to a certain extent. According to different situations, we need to choose the appropriate way to improve immunity, drugs need to be used under the guidance of a physician, it is recommended that patients who need to improve immunity to the relevant departments of regular hospitals for consultation.