5 cases of fistula of the maxillary sinus have been repaired by improved Teruo method, which uses flaps derived from submucous connective tissue of the palate and buccal mucous to repair the fistula. It has been satisfied after 4-13 years of follow-up observation. This article also discussed the difficulty of fistula repair and the advantage of the method. The authors thought that the method would be an ideal way to repair fistula of the maxillary sinus.