There are several chemotherapy regimens for lung cancer, depending on the different pathological types. Lung cancer is divided into squamous carcinoma, adenocarcinoma, small cell carcinoma and large cell carcinoma. Different chemotherapy regimens are needed for different pathological types of lung cancer. Details are as follows: 1. The commonly used chemotherapy regimen is generally once every three weeks for one day each time; 2. For small cell chemotherapy regimen, a cycle of 20 days will be used for 3-5 days each time, depending on the patient’s specific condition, because chemotherapy should also be evaluated according to the patient’s individuality to observe its tolerability; the dose of chemotherapy is calculated based on each patient’s height and weight to calculate the body surface The dose of chemotherapy is calculated based on the height and weight of each patient, and then the dose of chemotherapy to be used is calculated based on the surface area. Therefore, the chemotherapy regimen is different for different patients with different pathological types of lung cancer. The number of cycles is three weeks or four weeks, ranging from 1-3 days to 5 days each. Some chemotherapy regimens also involve a second cycle used on day 1 and again on day 8, with a second cycle on day 22.