We have been using Marumo's method for the surgical treatment of syndactyly. However, this method presents difficulties with incision designs, which we solved by devising a modified method. This method uses an angulated rectangular dorsal flap and a triangular miniflap made at the end of the dorsal flap. By rotating this miniflap proximally, the skin defect produced at the dorsal base of the digit after removal of the angulated dorsal rectangular flap becomes triangular. This triangular skin defect can be adequately covered by the triangular flap produced at the ventral side. In the article we describe this new operative method in detail and present cases to which the method has been applied.