Occult penis is a common congenital developmental abnormality and deformity, also known as buried penis. In concealed penis, the penis body is shrunken and hidden inside the body, and the only thing that protrudes out is the small pointed foreskin. If you squeeze the skin of the penis inward with your hand, the penis body will be revealed, and when you release your hand, the penis body will retract. Although occult penis is similar in appearance to circumcision, it is two completely different diseases. This method completely removes the foreskin to the root of the penis, which results in large trauma and serious postoperative edema. At present, we adopt the modified anaphylactic penile plastic lengthening, which adopts small incisions on both sides of the root of the penis, and the foreskin can be fixed to the white membrane and skin at the root of the penis without taking off the sleeve, so as to achieve the lengthening effect. The operation has small invasion, fast recovery after surgery and satisfactory results.