Testis is an important male reproductive organ, which has the functions of spermatogenesis and androgen secretion. Varicocele of spermatic vein will affect the blood supply of testis, lead to ischemia and hypoxia, testicular atrophy, decreased spermatogenic function, and affect reproductive function and sexual function. Mild and moderate varicocele can have a reversible effect on testis, and can cure and restore the spermatogenic function of testis. The damage of severe varicocele to testicular spermatogenic function is irreversible.