Capecitabine is a better anti-tumor chemotherapy drug, which is an oral preparation of intravenous fluorouracil chemotherapy drug and can be taken at home, so it is more convenient to use than the infused fluorouracil. It is currently used for post-operative adjuvant chemotherapy for colorectal cancer, and can also be used for palliative chemotherapy for advanced colorectal cancer. For metastatic breast cancer, capecitabine can also be chosen if anthracycline or paclitaxel-based chemotherapy drugs fail. For advanced or metastatic gastric cancer that cannot be removed surgically, capecitabine can also be preferred for chemotherapy, and its adverse effects are relatively mild, mostly mild to moderate, and are all relatively easy to manage.