Congenital anomalies of the hand were reviewed, which were treated at Seoul National University Hospital from 1973 to 1982. The Conclusions are as follows. 1. Polydactyly is the most common congenital anomaly of the hand in this series. The next common congenital hand anomalies are trigger digit, syndactyly in that order. 2. Better results had been obtained with early reconstructive surgery within one year after birth. 3. Authors propose a new classification of polydactyly. In Joint type (type 1), the extradigit has its own epiphysis in its origin,and in Epiphyseal plate type (type 2) the extradigit do not have its own epiphyseal plate and seems to be derived from the physis of the more developed adjacent digit. We observed 22 cases of joint type and 10 cases of epiphyseal plate type. 4. 6 cases of macrodactyly had been observed. The complicated reconstructive surgery such as Tsuge and Barsky operation resulted in digital necrosis. So more simple and effective operation such as symphalangization would be attempted.