Once colorectal cancer is diagnosed, radical surgery is the most effective method. The effect of surgical treatment for colon cancer is closely related to the early and late detection of cancer, and the five-year survival rate of limited colorectal cancer can reach over 70-90% after radical surgery. There are two kinds of surgical treatment methods: traditional open surgery and minimally invasive surgery; the former has long incision, big trauma and slow recovery. Minimally invasive surgery takes advantage of laparoscopic surgery, so that patients have another treatment option, especially laparoscopic surgery for colon cancer has been recognized by academic circles, and most colon cancer surgeries can be completed by laparoscopic technology. Surgical requirements Radical surgery for colon cancer should remove the primary lesion and the lymph nodes in the drainage area as a whole. The surgical margins should be sufficient to ensure a safe area free of tumor invasion, and the resection should include sufficient normal bowel segments on both sides of the tumor. If the tumor invades the surrounding tissues or organs and needs to be removed together, the margins should be sufficient and the lymph nodes in the area should be removed at the same time. However, in order to clear the regional lymph nodes that may metastasize and to clear the lymph nodes in the drainage area of the root of the mesentery, the main blood vessels should be ligated, and the extent of resection of intestinal segments should be determined according to the blood flow after ligating the blood vessels; completely clear the lymph nodes in the drainage area; avoid squeezing the tumor; and prevent intestinal dissemination Surgical types 1. Right hemicolectomy: Applicable to the cecum, ascending colon and hepatic flexure of the colon. ascending colon and hepatic flexure of the colon. Scope of resection: 15-20 cm of the end of the ileum, the right half of the cecum, ascending colon and transverse colon, together with the attached mesentery and lymph nodes. The cancer of the hepatic flexure also requires resection of the large part of the transverse colon and the lymph nodes of the right artery group of the gastroretina. After resection, end-to-end anastomosis or end-to-side anastomosis of the left half of the transverse colon is performed (suture closure of the colon section). 2. Transverse colectomy: Applicable to transverse colon cancer. Scope of resection: transverse colon and its hepatic flexure and splenic flexure. After resection, end-to-end anastomosis of ascending and descending colon is performed. If the anastomotic tension is too large, right hemicolectomy can be added for ileo-colonic anastomosis. 3.Left hemicolectomy: it is suitable for cancer of descending colon and splenic flexure of colon. The scope of resection: left half of transverse colon, descending colon, part or all of sigmoid colon, together with the attached mesentery and lymph nodes. After resection, the colon and the colon or the colon and the rectum should be anastomosed end to end. 4.Radical resection of sigmoid colon cancer Depending on the specific location of the cancer, in addition to resection of the sigmoid colon, descending colon resection or partial rectal resection may be done. To make colo-colonic or colo-rectal anastomosis.