In our population of reproductive age, the incidence of male infertility can reach 10%~12%. Among them, 10%-15% are caused by obstructive azoospermia (OA), and epididymal obstruction is the most common cause of OA, accounting for about 30%-67% of OA. There are two main treatments for this: microscopic reconstruction of the male reproductive tract and assisted reproduction techniques. Comparing the two, microsurgery has no effect on female physiology and is more cost-effective. And with the development of microvascular epididymal anastomosis, the efficacy of epididymal obstruction has improved and in some areas has become the treatment of choice for this condition. Diagnosis of epididymal obstructive azoospermia: 1. 2 routine semen examinations at least 6 weeks apart confirmed azoospermia; 2. Normal semen volume, pH and seminal plasma fructose; 3. Normal serum total testosterone and follicle stimulating hormone (FSH); 4. Scrotal ultrasound and rectal ultrasound examination confirmed normal testicular volume and no dilatation of seminal vesicles ejaculatory duct; 5. Previous history of fertility or testicular biopsy confirmed normal spermatogenic function.