This is a research with scientific and practical significance which have new contributions for clinical practice in surgical oncology in the selection and application of the anterior resection and anastomosis technique totally by mechanical staplers in the treatment for middle and low rectal cancer aiming to shorten surgical time averaging of 113.4 minutes. In this sense, the low rate of disaster and complications is acceptably and more importantly, anal sphincter muscle will be preserved for tumors which are at least 4 cm from anal margin; accordingly cancer patients quality of life will be improved and oncological features are guaranteed as radically.