Polydactyly is a congenital deformity that has a genetic component and can occur in conjunction with “syndactyly”. The goal of surgical treatment for polydactyly is to restore function and improve appearance. The surgery not only requires skin repair, but also may involve tendon and bone reconstruction. The timing of treatment for polydactyly: surgery should be performed as early as possible in the preschool years without affecting the development of the hand, so as not to affect the psychological development of the affected child. Polydactyly is generally not functional or deformed, so the extra fingers should be removed so as not to affect the normal function of the hand and to improve the aesthetics after removal. However, since the majority of polydactyly grows next to the thumb (also known as “compound thumb deformity”), and the thumb is the most important finger, it is important to preserve and reconstruct the function of the thumb during surgical removal. If the preserved thumb is crooked, it is often caused by a deformity of the ligament or an extra piece of deformed bone, and should be corrected as soon as possible. 2, precautions before surgery: you should choose a professional plastic surgery or hand surgery hospital; clearly diagnose functional trunk fingers and non-functional deformed fingers through various imaging and physical examinations before treatment. 3, post-treatment precautions: after surgery to elevate the affected limb, with implants, tendon reconstruction, bone splicing and other patients early do not move the affected limb at will; 1 month after surgery, the affected limb hand joints can begin to exercise, do grasping, grip, pinching training, but also daily life actions, such as washing, brushing teeth, tying shoelaces, buttoning, patting leather ball, screwing bottle caps, threading needles, writing, application of computer operations, etc.; after surgery should be regularly After surgery, the patient should be reviewed regularly until adulthood. Case: Pre-operative and post-operative comparison