Compared with the traditional surgery, microscopic spermatic vein ligation under the external inguinal ring has the following advantages: 1. Minimally invasive Surgical incision is only 2-4cm, the spermatic cord can be seen by cutting through the skin and fat tissue during surgery, the surgery is less traumatic, and the pain is greatly reduced after the surgery. 2. The surgical incision is located in the inguinal ring under the mouth, that is, the distribution area of pubic hair, after the recovery of pubic hair to cover the wound, it is not easy to be found. 3.Low complication During the operation, only the veins are ligated under the microscope, and the arteries, lymphatic vessels and vas deferens are preserved, which significantly reduces the occurrence of testicular syringomyelia and testicular atrophy and other complications. 4.Low recurrence rate Intraoperative ligation of internal spermatic vein, external spermatic vein, vas deferens vein and testicular draining vein is thorough without any leakage, no leakage of ligation, and low recurrence rate after operation. 5. Improvement of semen quality and high pregnancy rate One year after the operation, 70% of the patients’ semen quality will be improved, and 32% of the patients will be able to conceive naturally.