Congenital syndactyly is a common congenital hand deformity second only to polydactyly. There are many types of syndactyly and the degree of severity varies greatly, characterized by skin and soft tissue connection between two or more fingers, or with fused finger bones, defective finger bone development and disorderly arrangement. The middle ring finger syndactyly is the most common, followed by the ring little finger syndactyly and the middle finger syndactyly, the middle ring syndactyly is the most common among the 3 fingers syndactyly, and the complete syndactyly of the 4 fingers is called palmar hand. Those with pure soft tissue connection are called cutaneous syndactyly. If there is fusion of finger bones, it is called bony syndactyly. The developmental disorder of metacarpal and phalangeal bones is called compound syndactyly. Most scholars advocate early surgery, especially for unequal syndactyly, otherwise skeletal deformities of growth and development may occur. The age of correction is 3 to 5 years old, and treatment should be completed before school age. The incision flap should be reasonably designed to avoid postoperative scar contracture during surgical orthopedics. Multifinger splitting must be treated in stages with sufficient intervals in between to avoid ischemic necrosis of the finger.