Abstract: Objective To investigate the feasibility，safety and efficacy of laparoscopic D3 lymph node dissection for sigmoid cancer with preservation of superior rectal artery.Methods Laparoscopic D3 lymph node dissection of superior rectal artery was performed in 25 cases and direct dissection of inferior mesenteric artery without preservation of superior rectal artery in 20 cases at the same time.The clinicopathological data，operative time，intestinal function recovery and postoperative complications were compared between the two groups.Results The operative time in SRA group and non-SRA group was（202.2±46.50）min and（147.5±37.3）min，and the recovery time of intestinal function was（2.1±1.1）days and（3.1 ±1.3）days，The hospitalization time was（8.1±0.9）days and（11.5±1.1）days，there were significant difference between the two groups（P<0.05）.The intraoperative bleeding volume in the SRA-sparing group and the non-SRA-sparing group was（65.3 ±10.2）ml and（59.2±9.9）ml，The number of lymph node dissectionwas（14.4±3.5）and（15.3±4.2），and the incidence of postoperative complications was 8%（2/25）and 15%（3/20），there were no significant difference between the two groups（P＞0.05）.Conclusions The laparoscopic D3 lymph node dissection  with preservation of superior rectal artery for sigmoid cancer is safe and feasible，the patients can recover early，and without increasing complication incidence，Thus  has great clinical value.

Key words: sigmoid cancer, superior rectal artery, lymph node dissection