The WHO definition of male infertility aetiology diagnosis is. The couple has a history of at least 12 months of sexual initiation without contraception and the female partner has been excluded from infertility. The wife has not been able to conceive. The generally accepted definition of male infertility on the mainland is a history of at least 2 years of non-contraceptive sexual intercourse. Male infertility is clinically classified according to the different causes of male infertility: (1) Abnormal sexual infertility: such as erectile dysfunction, non-ejaculation or retrograde ejaculation. The semen of the male cannot reach the vagina of the female normally. (2) Immune infertility: 50% of the active sperm have antibodies wrapped around them, which can be called immune infertility. (3) Simple abnormal seminal plasma infertility: the diagnosis should have: ① normal sexual function; ② normal sperm; ③ abnormal seminal plasma or sperm agglutination or leukocytosis. (4) Medically induced infertility: the patient has clear medical (e.g. cytotoxic drugs, estrogen and progestin, cortisol in large spikes, nitrofuran derivatives, salazosulfapyridine, etc.) or surgical (e.g. pelvic or retroperitoneal lymph node dissection, lumbar sympathectomy, vasectomy, etc.) causes of semen abnormalities. (5) Infertility due to systemic factors: abnormal sperm because of systemic diseases (such as ciliary immobility syndrome, recent hyperthermia, etc.), environmental factors (such as exposure to radioactive substances, toxic substances, chemical agents. Long-term hot places to work together, hot water baths, wearing tight pants, etc.), alcoholism, drug abuse, etc. That can be diagnosed. (6) Congenital abnormal infertility: such as abnormal sperm infertility caused by abnormal cell karyotype or cryptorchidism, etc. (7) Acquired testicular damage infertility: such as mumps-induced orchitis or other causes of testicular atrophy. Sperm abnormalities appear. (8) Varicocele infertility: Varicocele as a cause of infertility. It must be accompanied by abnormal semen analysis: varicocele with normal semen. No heart should be considered as the cause of infertility. The possible mechanisms of male infertility due to varicocele are: ① In varicocele. Lack of good venous Inl flow in the testis. The temperature of the testis increases; (2) the pressure in the spermatic vein increases; (3) hypoxia and pH changes in the tissues surrounding the testis disturb the abnormal metabolism of the testis; (4) adrenal metabolites (such as cortisol, catecholamines, prostaglandins, etc.) flow back into the testis. (5) Testicular interstitial cell damage. Affects testosterone secretion. (9) Infectious infertility of accessory gonads: such as orchitis, epididymitis, vasovaginitis and prostatitis, etc.? With little or weak sperm semen or deformed sperm semen. (10) Endocrine infertility: such as primary or secondary hypogonadism, pituitary tumors and other causes of infertility. (11) Vasectomy obstructive infertility: no sperm on semen examination. The testicular biopsy proves that there are spermatozoa in the varicocele. (12) Idiopathic infertility: If none of the above diagnoses apply. Semen analysis suggests few sperm, weak sperm, deformed sperm or no sperm. It can be diagnosed as: ① idiopathic oligospermia; ② idiopathic weak spermia; ③ idiopathic teratozoospermia; ④ idiopathic azoospermia, respectively.