Polydactyly is a very common birth defect. In our daily life, we often encounter patients with polydactyly, which is a normal skeletal development, but polydactyly usually has six fingers or even seven or eight fingers. Some of these deformities, some have an extra finger, there may be no bony structure, no joints, only a soft tissue, so it may be easier to treat, some are a complete finger structure, the incidence of polydactyly in our country is relatively high, it ranks in the top five in the ranking of birth defects, and is also a very common occurrence of defects.