Elderly people who have recurrent lung infections and fever are usually weak and easily invaded by pathogenic microorganisms, so they will have frequent lung infections and fever. The method to improve their body resistance are: 1, to give the patient to enhance nutrition. 2, arrange reasonable work and rest, can not be overworked. 3, to give the patient some psychological treatment, to ensure that the mood is relaxed, not to have excessive stress. 4, strengthen the exercise, appropriate exercise, such as running, and tai chi, etc., are very good to improve the patient resistance.