There are more chemotherapy drugs for intestinal cancer, and the three main categories are: fluorouracil, platinum (mainly oxaliplatin) and irinotecan, as follows: 1. First-line chemotherapy drugs: mainly 5-FU (pyrimidine drugs), capecitabine and oxaliplatin, which can kill tumor cells in the body, prevent tumor proliferation and metastasis, prevent tumor recurrence, etc.; 2. For patients with recurrent bowel cancer or those who failed in first-line treatment, they need to consider the combination of second-line drugs, such as irinotecan; 3. Third-line chemotherapy drugs: TAS-102 (pyrimidine drugs), which is suitable for use after drug resistance and disease progression; 4. drugs for targeted therapy, such as cetuximab and bevacizumab.