Congenital syndactyly has an incidence of 1 in 2000 and is a relatively common clinical deformity of the finger. The separation of syndactyly has been reported as early as 1810 and has been followed by Zeller’s “V” flap method in 1810, Differbach’s quadrilateral flap method in 1834, Norton’s first proposal to reconstruct the finger webs with the dorsal palmar triangular flap in 1881, Cronin’s serrated incision finger webs in 1956, and Killiam’s method to Cronin’s method in 1985. Cronin proposed a serrated incision for finger web formation and finger separation, and Killiam improved Cronin’s method in 1985. The Cronin method is currently the most widely used. However, there are more problems, such as scar contracture; finger flexion deformity; recurrence; and too deep or too shallow webbing. In recent years, there has been a consensus on the separation of juxtaposed finger deformities, emphasizing: 1) early separation (6-16 months); 2) reconstruction of the finger web; and 3) reconstruction of the nail crease. The ideal finger web should have three conditions, i.e., 45° inclination angle; hourglass-like structure; and having a palmar flexion transverse stripe. With the introduction of the fat reduction technique in 2001, it became possible to gradually get rid of the implant for juxtaposition finger separation. Successful juxtaposed finger deformity separation must focus on the reconstruction of the subunits of the hand, on the application of dorsal finger flap reconstruction of the finger web combined with the fat reduction technique, and without skin grafting, with short surgical time and greatly reduced postoperative complications such as scar contracture, finger flexion deformity, and recurrence.