Polydactyly is the most common congenital malformation of the hand, and is most common next to the thumb. The etiology is unknown, but in some cases it is genetic and intergenerational. The shape and structure of polydactyly varies widely and can be as simple as a dermatome attached to the tip of the skin to a complete finger. The angle of growth of the polydactyly also varies, with some polydactyly being at right angles to the radial or ulnar margins of the hand. The polydactyly may exist alone or in conjunction with other deformities, such as compound thumb deformity, or with three or four extra fingers, forming a “mirror hand” deformity. The ulnar polydactyly can be accompanied by various other deformities, such as syndactyly, trigeminal thumb, spinal deformity, nail dysplasia, etc. Central polydactyly is often accompanied by syndactyly, which is more common bilaterally and named as polydactyly, and central polydactyly is often a kind of split hand deformity. Since there are many types of polydactyly, surgery for polydactyly is not only a simple excision, but also includes removal of the polydactyly, repair of the joint capsule and ligaments, and repair of excess bone and joint surfaces. Bilateral deformities of the fingers or toes, or multiple deformities at the same time, can be removed together. Surgery for multiple finger (toe) deformities is usually performed using brachial plexus (sacral canal) anesthesia. Since the child is young at the time of surgery and the surgery is delicate and requires absolute braking, intravenous general anesthesia is usually added, which is now very safe and does not affect the child significantly. After the surgery, some children will have swelling at the end of the finger, which is a normal phenomenon, this is related to the local stimulation of the surgery or the pressure bandage is too tight, the former 2,3 days after the swelling will go down, the latter will return to normal when the bandage is released. During the surgery, because the preserved finger (toe) has a deformity of radial ulnar deviation, it is sometimes given internal fixation with steel pins while repairing the joint capsule and ligaments, and postoperative plaster (splint) fixation for 4 weeks. After removal of the pins, functional exercises are started to restore the function of the fingers (toes). However, there are still a considerable number of polydactyly with complex deformity, tilted joint surfaces of normal fingers (toes), or large metacarpal and metatarsal bones and abnormal tendon development, which still have more obvious deformity with development after surgery. The wound can be removed 2 weeks after surgery, and the scar is still obvious. 1 week after the removal of the stitches, scar removal medication can be started, but scar removal medication cannot completely remove the scar.