Whether a six-year-old child with cryptorchidism can have children after surgery needs to be determined by examining semen quality in adulthood. Cryptorchidism only has a chance to affect the reproductive function, but not absolutely. Usually the ultrastructure inside the testes of cryptorchidism may change after two years old, affecting the quality of sperm production, but not absolutely affecting the quality of fertility and causing infertility. Early treatment, lowering the testicle into the scrotum, and gradual recovery during the development of the testicle, will have no effect on fertility as long as the semen quality is normal. Clinically, there are also cases of unilateral normal testes and contralateral testicular agenesis, but the patient’s normal pregnancy is not affected in any way. There are also clinical cases where pregnancy is normal after cryptorchidism descent surgery at the age of six or older, so it is necessary to check the semen routine in adulthood and decide whether there is fertility according to the semen routine. For most of the patients, the surgical treatment does not affect the reproductive function.