Lung cancer patients should undergo surgery as long as they are eligible for surgery, but surgery is only part of the comprehensive treatment of lung cancer, and most lung cancer patients need adjuvant chemotherapy after surgery. 1. Lung cancer is a systemic disease, not just a lung disease. Surgery only solves the most prominent problems of the lung, but the problems of the whole body can only be solved by chemotherapy and other treatments. 2.Lung cancer is a disease of cell mutation. Although surgery has removed the main lesion of the lung, it can do nothing for the sporadic cancer cells that walk the whole body, and postoperative adjuvant chemotherapy can kill them and enable the patient to survive longer. 3.Adjuvant chemotherapy after lung cancer surgery makes more patients get benefits. It has been proved that adjuvant chemotherapy after lung cancer surgery is beneficial to improve the survival rate, especially for patients with intermediate and advanced lung cancer. 4. Currently, adjuvant chemotherapy after lung cancer surgery is generally recommended to use vincristine + cisplatin regimen or docetaxel + carboplatin regimen, which has less toxic side effects and can be tolerated by most patients. 5.Patients with lung cancer can receive immunotherapy at the same time as adjuvant chemotherapy, which is beneficial to improve the immune ability of the body and reduce the toxic side effects of chemotherapy. For patients with economic conditions, molecular targeted drug therapy can be used at the same time, which can inhibit the occurrence and development of tumor from multiple ways. 7. Adjuvant chemotherapy after lung cancer surgery is a professional task, which not all doctors are competent to perform. 8. For the dosage of chemotherapy drugs, it is somewhat different from the dosage without surgical treatment, and it is related to the thoroughness of surgical resection as well as the individual differences of patients, so it is better to get the guidance of thoracic surgeons, and if possible, it can be done in lung cancer centers that carry out individualized and comprehensive treatment of lung cancer.