Lung infection after chemotherapy for lung cancer is caused by the decline of immunity after chemotherapy, which leads to easy invasion of virus and bacteria. Chemotherapy for lung cancer will have strong killing effect on immune cells, resulting in decreased immunity and patients are prone to infection. After chemotherapy for lung cancer patients, blood routine should be checked on time, and if there is a drop in white blood cells, timely medication should be given. After chemotherapy, patients should also pay attention to avoid going to places where people gather to reduce the probability of infection. Life should also pay attention to develop good sleep habits, ensure nutritional balance, all help to improve the patient’s immunity, reduce the probability of lung infection. Infection, should be timely anti-infection treatment, to avoid causing severe infection.