Abstract: Objective: To investigate the buccal fat pad for filling in wounds created by pulling a tooth in resection of cysts and preventing oroantral fistula. Methods: The buccal fat pad was used for filling in wounds created by pulling a tooth in resection of cysts and preventing oroantral fistula in 14 patients with cyst of maxilla. Results: Surgery succeeded in 14 patients. After half a year, the surface mucous membrane quality of material, the luster and periphery the mucous membrane was not easy to differentiate from the adjacent mucous. The mouth-opening was not limited and the shallow vestibulum oris was not found. Conclusions: This surgery is simple with the hidden donor area and less complications.