Inclusion Criteria:  Male, 18-70 years of age, informed consent; Tumors from anal edge 6 ~ 12 cm (measured by rigid proctoscope); Rectal cancer confirmed pathologically by endoscopic biopsy; Preoperative cT1-3aN0M0 stage (ESMO, 2013); Ro resection is expected; Normal urinary function, normal erection function and ejaculation function grading as I level;  Exclusion Criteria:  History of abdominal and pelvic major surgery; Emergency surgery is needed due to the complication (bleeding, obstruction, or perforation) caused by rectal cancer; Pelvic or distant metastasis; Neoadjuvant radiotherapy or chemoradiotherapy; No sexual life;