Cryptorchidism, also known as incomplete testicular descent, is a condition in which the testicles fail to descend into the scrotum according to the normal developmental process. The incidence of cryptorchidism in newborns is about 4%. As children grow older, some of the testes with incomplete descent can still descend on their own, and the incidence of cryptorchidism has decreased to 0.66% at the age of 1 year. However, after the age of 1 year, the chance of testicular descent on its own will be significantly reduced. Children with cryptorchidism usually do not have any uncomfortable symptoms, but parents can find that they cannot feel the testicles in one or both scrotums if they pay attention. When this happens, parents should take their children to the doctor in time. The testicles of a normal human are located in the scrotum. The appropriate temperature for testicular development is about 35℃. Based on the special structure of the scrotal wall, the testicles inside the scrotum are always in an environment of about 35℃. The testes with hypospadias develop lesions mainly degenerative degeneration of the varicocele due to the ambient temperature above 35°C. The degenerated varicocele cannot produce mature sperm. In case of bilateral cryptorchidism, it will easily lead to infertility; in case of unilateral cryptorchidism, it may also affect the lesion of the testicle that descends to the scrotum on the opposite side; if the undescended testicle is located near the pubic tubercle behind the inguinal canal, its position is superficial and fixed, and it is more likely to be damaged by external force. In addition, the undescended testicle is more than 30 times more likely to develop a tumor than a normal testicle. Children with cryptorchidism at the age of 1-2 weeks can still be treated conservatively with chorionic gonadotropin. Scholars agree that the age of surgical treatment is preferable to 2 years old.