The formation of syndactyly is mainly associated with congenital factors, and severe syndactyly can result in finger dysfunction, requiring surgery in most cases. Syndactyly is a condition in which the webbing between the fingers is enlarged, causing the fingers to join and merge. The development of syndactyly is mainly related to the developmental abnormality of the web, when the web has apoptosis and splitting abnormality during development, it will form hyperplasia of the web, and ultimately, syndactyly is formed by the connection of adjacent fingers due to the hyperplasia of the web. In severe syndactyly, the extensor function of the fingers is severely affected, as well as the flexion and extension function and fine motor movements of one finger, resulting in varying degrees of mobility. For severe syndactyly, surgical treatment such as release or separation of the web is needed to improve the syndactyly function.