Ensuring adequate sleep, balanced nutrition and moderate exercise all help to improve immunity. The fact is that the immune system needs to be balanced. Ways to enhance immunity are: i. High quality sleep. High-quality sleep can promote the body to produce sleep factor, sleep factor can promote the increase of white blood cells, while strengthening the detoxification ability of the liver. Second, optimistic emotions. Stress will cause the body to produce inhibitory factors, and this inhibitory factor will directly affect the normal work of immune cells. Third, proper exercise. Exercise not only enhances the function of the immune system, but also increases the number of immune cells, thus strengthening immunity. Fourth, more vitamins and minerals. Vitamins and minerals can influence the number and vitality of various types of immune cells. Therefore, it is recommended to eat more fresh fruits to replenish the vitamins and minerals needed by the body.