Tumors that require chemotherapy are, in general, tumors that are sensitive to chemotherapy, mainly malignant hematologic diseases such as leukemia and lymphoma, which can be cured by chemotherapy. Chemotherapy has an important place in it, and only with chemotherapy can leukemia, lymphoma, etc. be cured. In addition to chemotherapy for leukemia and lymphoma, it can also be used for postoperative adjuvant treatment of breast cancer, lung cancer, colorectal cancer, and neoadjuvant treatment before surgery. Palliative treatment of advanced lung cancer and breast cancer can also be treated with chemotherapy. In conclusion, chemotherapy has a very high status in malignant tumors. In addition to chemotherapy, there are also radiotherapy, targeted therapy, surgery and other treatment means for malignant tumors.