The course of chemotherapy after surgery for lung adenocarcinoma T2N0M0 is generally recommended to be 4 cycles of medication, 21 days as a treatment cycle, and the specific time needs to be determined according to the patient’s own situation and chemotherapy regimen. Adjuvant chemotherapy after lung adenocarcinoma surgery usually requires 4 cycles, and the main purpose is to carry out preventive chemotherapy after surgery to kill the remaining cancer cells in the body and prevent recurrence and metastasis in the early stage. Generally, chest CT, abdominal ultrasound or CT should be rechecked once in every 2 cycles of treatment. If patients have symptoms in brain, bone and abdomen, they should consult the doctor at any time and complete the corresponding examinations such as cranial MRI and bone radionuclide scanning. The specific time needs to be determined according to the patient’s personal constitution, some patients have poor tolerance and greater toxic adverse reactions to chemotherapy, the cycle should be prolonged to allow the body to adjust and recover and rebuild the immune function. It is recommended that patients can consult a specialist, who will make a comprehensive assessment of the patient’s physical condition, so as to determine the cycle and duration.