Chemotherapeutic drugs are classified accordingly according to their molecular structure and pharmacological toxicity. Drugs commonly used in lung cancer such as alkylating agents such as cyclophosphamide, isocyclophosphamide, simustine, etc., antibiotics such as mitomycin, bleomycin, adriamycin, epiamycin, antimetabolites such as gemcitabine, 5-fluorouracil, plants such as vincristine, vincristine, vincristine, topoisomerase inhibitors such as isocyclophosphine and hydroxycamptothecin, topotecan, etc. The paclitaxel class includes paclitaxel and doxorubicin, cisplatin, carboplatin, nedaplatin and oxaliplatin are also commonly used in lung cancer, as well as pemetrexed drugs. These drugs have different principles of action and different mechanisms of cellular action, so they can often be used in combination. The traditional chemotherapy for lung cancer is CAP, i.e. cyclophosphamide, adriamycin, cisplatin-based regimen, which is less used clinically nowadays because of the relatively large toxic effects, and generally the third-generation chemotherapy drugs such as gemcitabine, vincristine, paclitaxel and pemetrexed are used, which are selected according to different pathological types.