Cryptorchid surgery in children is performed under general anesthesia by making a curved skin incision 1-2 cm above the inguinal ligament, parallel to the transverse abdominal stripe, cutting the tendon membrane of the external oblique abdominal muscle in the direction of the fibers, opening the subcutaneous ring, cutting the levator muscle, exposing the inguinal canal, and exposing the internal ring upward. The testis is searched for in the inguinal canal, and the testis is cut along the lateral side of the testis, and the testicular sheath capsule covering the testis is opened to reveal the testis and spermatic cord, and the testis is gently lifted, and the spermatic vessels and vas deferens are then clearly revealed. All muscles and fibrous adhesions around the testis and spermatic cord are bluntly released, so that the testis and spermatic cord are fully free and the hernia sac is separated from the spermatic cord and the hernia sac is transected. After the hernia sac is separated to a high level only, the peritoneal closure is completed by ligation or penetrating sutures with a No. 4 silk thread. After complete release of the spermatic cord of the testis, a transverse incision was made in the skin at the base of the ipsilateral scrotum, the gap was separated between the skin and the meatus, the testis was placed in the cavity between the outside of the meatus and the subcutis, the testis was fixed to the meatus for several stitches, and then the scrotal skin was sutured.