For patients' comfort and occlusal efficiency, dental implant rehabilitation might be one of the best options in patients suffering from missing of bilateral posterior teeth. When the maxillary ridge is severe atrophic, it isn't suitable to restore it by dental implantation combined with bone augmentation simultaneously. This case presents a patient whose upper bilateral posterior edentulous ridge is severe atrophic due to maxillary sinus expansion. We suggested this patient perform lateral widow sinus lifting surgery, and then dental implantation nine months later. (J. Family Dent. 6(2): 49-56, 2011)