Polydactyly refers to the superfluous fingers other than normal fingers, and its incidence rate is about 1 per thousand. The hand is the most important tool in people’s daily life, work, study and social interaction, which is called “the tool of wisdom”. Polydactyly not only affects the patient’s hand function as a tool, affecting his daily life, work, and in appearance is not satisfactory, affecting the patient’s social interaction and self-esteem, self-confidence development. Therefore, polydactyly requires surgical treatment, and the most important treatment principle is early surgical treatment to correct the deformity, which is conducive to the physical and mental development of patients. Don’t look at a small polydactyly, but it contains a big mystery, due to its complex multiple tendon ectopic, bone deformity, surgery requires the integrated application of microsurgical techniques, plastic surgery techniques and other techniques. The main surgical points are to repair the lateral collateral ligaments of the preserved finger joints, transfer the tendons of the multiple fingers to the preserved finger, reestablish the balance of muscle strength of the preserved finger, and trim the skin flap so that the preserved finger is basically the same size as the corresponding finger on the opposite side, and in short, the aim is to rebuild a finger that is similar to a normal finger in terms of function and appearance. Currently, due to the development of surgical techniques and the improvement of pediatric anesthesia, surgery is usually performed in infancy (after 3 months of age), which is more conducive to the reconstruction of the anatomical structure and function of the child’s hand and upper limb, and the surgical result is satisfactory and relatively safe at this time.