Chemotherapy after colon cancer surgery should be given about 3-4 weeks after surgery, and it should also be decided in the light of the patient’s recovery. If the patient recovers very well after surgery, the stitches can be removed in 1 week after surgery, and the patient can basically resume normal diet and gain weight in 2 weeks after surgery, it is recommended to start chemotherapy in the 3rd week after surgery. If the patient has an average recovery after surgery, it is recommended to start chemotherapy in about 4 weeks. If the patient’s recovery after surgery is very slow, such as complications, postoperative abdominal infection and anastomotic fistula, or even bleeding in the abdominal cavity, the time of chemotherapy should be postponed appropriately, because after radical tumor surgery, there may be cancer cells remaining in the abdominal cavity, and chemotherapy drugs are needed to further kill the cancer cells in the body, so the earlier the better. In the process of chemotherapy, the patient’s immunity will also be reduced, so once the body recovers poorly, the time of chemotherapy can be postponed appropriately.