Laparoscopic anterior resection for low rectal cancer with preservation of the left colonic artery，following the principles of TME and neural function preservation，aims to maximize anastomosis blood supply and maintain autonomic neural function. The surgery has significant advantages in reducing surgical complications and accelerating recovery.The surgical procedure involves a five-port technique under endotracheal intubation and general anesthesia. Firstly，the sigmoid colon is dissected from the lateral abdominal wall，then the sigmoid mesocolic gutteris exposed. The dissection proceeds to the right side of the mesentery，entering the Toldt’s space in front of the sacroiliac promontory. The superior rectal artery，the superior mesenteric artery，and the left colonic artery are carefully dissected，and 253 lymph nodes are dissected. The superior rectal artery is ligated and divided according to the principles of TME. The rectum and its mesentery are separated until reaching the level of the pelvic muscle，with the Denonvilliers fascia and the lateral ligaments of the rectum being preserved to protect the vascular and nerve bundles. The rectum is divided at least 2 cm distal to the tumor.A transverse incision is made in the lower left abdomen，and the mesentery of the colon is dissected and the specimen is removed. The proximal end of the colon is placed the stapler seat，and pneumoperitoneum is reestablished. The rectal-colonic anastomosis is created under direct visualization.