The surgical procedure may damage the autonomic nerves of the penile corpus cavernosum and cause male sexual dysfunction. The recovery of sexual function after surgery is mainly related to three factors: 1. age. 91% of patients under 50 years old recovered sexual function after surgery, 85% between 50 and 60 years old, 58% between 60 and 70 years old, and only 25% over 70 years old. Because prostate cancer mainly occurs in middle-aged and elderly people, and a significant proportion of these patients have erectile dysfunction before surgery. 2. Tumor stage. Patients whose tumors penetrate the prostate envelope or invade the seminal vesicles are twice as likely to have erectile dysfunction after surgery as those with early stage. 3.With or without preserving the vascular nerve bundle during surgery. The maintenance of male erectile function is mainly controlled by a tissue around the prostate called the vascular nerve bundle. Whether the vascular nerve bundle is preserved during surgery depends mainly on the patient’s tumor condition and preoperative sexual function. If the patient has a late tumor stage and invades the envelope, in order to achieve the goal of radical treatment, the vascular nerve bundle is often chosen not to be preserved because the preservation may lead to the residual tumor.