Some patients can have children after cryptorchidism surgery in adults and some cannot, which is related to whether cryptorchidism causes abnormalities in the function of the testicles. The testicle does not descend completely into the scrotum, the testicle may not develop normally, and the normal nerve function of the testicular spermatogenic tubules will be inhibited. Cryptorchidism is mainly when the testicles do not descend normally into the scrotum. It is recommended that ultrasound must be done to confirm whether the cryptorchid is located in the retroperitoneum, inguinal canal, or at the entrance of the scrotum. If it is located at the entrance of the scrotum, it may affect the probability of fertility, while if it is located in the retroperitoneum, it will definitely lead to the impaired function of the testicles. It is recommended that surgery should be performed early after the discovery of cryptorchidism, as long-term cryptorchidism in the retroperitoneum also has the possibility of cancer.