Most surgeons suggest the use of fecal diverting to address the high morbidity and mortality associated with anastomotic leakage (AL) in patients with high risk factors on AL who are undergoing low anterior resections(LAR). This exploratory study was conducted to evaluate the efficacy and safety of one kind of controllable tube ileostomy(CTI), which was designed to protect rectal anastomosis in patients with high risk factors on AL. Results of SCCI were compared to those of the loop ileostomy (LI) method.