Male Fertility Preservation (Reproductive Insurance) Applicable People: 1. Healthy men: any person who has the need to preserve his own reproductive ability 2. Tumor patients: before surgery and chemoradiation therapy, semen can be frozen for assisted reproduction; 3. High-risk occupations: such as military personnel, firefighters, athletes, etc., semen can be frozen in case of accidental injuries to the reproductive system resulting in the inability to bear children; 4. Patients with oligozoospermia: semen shows a decreasing trend, or even azoospermia may be possible; 5. Even azoospermia may be possible; 5, need to perform assisted reproduction, worried about the day of sperm extraction can not be normal spermatogenesis; 6, patients with ejaculation: can be electrostimulation sperm extraction semen removal frozen, ready for future assisted reproduction; 7, patients with azoospermia: epididymal, testicular puncture, testicular biopsy and testicular micro spermatogenesis to obtain viable sperm; 8, vasectomy before; 9, have long-term fertility requirements. .