The resection styles of sigmoid colon cancer, according to the condition, are local resection; resection of tumor bowel segment; radical surgery; total colonic, subtotal colorectal and total colorectal resection. 1. Local resection: this type of operation only removes part of the intestinal wall in the area where the tumor is located, which is suitable for relatively limited type B colon cancer or early type B colon cancer. 2. Segmental resection of tumor: this type of surgery needs to resect a segment of intestinal tube including the tumor, and retain a certain margin, with a larger scope of resection, and is applicable to type B colon cancer that has not yet spread. 3. Radical surgery: radical surgery refers to the complete resection of the primary tumor segment and clearing of related lymph nodes, which is very effective for type B colon cancer without distant metastasis. Total colorectal, subtotal colorectal and total colorectal resection are respectively resection of the whole colon, the whole colon and a certain length of rectum, the whole colorectum and stoma, all of which belong to radical surgery. It is suitable for cases with multiple metastases of the tumor, and intraoperative clearance of relevant lymph nodes is also required.