This a simple randomized, single-center, single-blind, randomized controlled trial study.The patients were randomly divided into experimental groups and control groups by computer.The perioperative recovery data, complications and oncology index of total laparoscopic colectomy with intracorporeal anastomosis and laparoscopic-assisted colectomy with extracorporeal anastomosis would be compared.
Objective:The comparison between total laparoscopic colectomy with intracorporeal anastomosis by overlap method and laparoscopic-assisted colectomy with extracorporeal anastomosis for colon cancer surgery.~Condition or disease：Left colon cancer Intervention/treatment： Procedure:Intracorporeal left colectomy Overlap anastomosis Procedure: Extracorporeal left colectomy convention anastomosis