Too low platelets after chemotherapy for lung cancer can be treated by platelet-raising drugs under doctor’s guidance, and too low platelets can also be transfused for emergency. Chemotherapeutic drugs have inhibitory effect on bone marrow, which can lead to platelet lowering. Mild lowering is generally with the end of chemotherapy, and the bone marrow function can be recovered by itself, if moderate lowering, patients have bleeding risk, and patients should apply platelet-raising drugs under the guidance of doctors. If platelets are severely reduced, platelet transfusion is needed to save the patient’s life and thrombopoietic factor should be injected as early as possible. Patients with low platelets after chemotherapy for lung cancer should seek medical treatment in time to avoid the risk of bleeding, and use drugs under the guidance of doctors to relieve the condition as soon as possible.