Functional magnetic resonance imaging is a new magnetic resonance imaging inspection method, which can reflect the imageological change of cerebral cortex when human body is doing various functional movements. The functional movements of the oral cavity such as chewing, gustation, swallowing which is closely related to the changes in the cerebral cortex. Recent years, scholars home and abroad had done many oral researches by fMRI. The results of these studies have great guiding significance to the clinical work and research. It indicates that we can explore more clinical diseases through fMRI technology. This article summarizes the application of fMRI in oral functional research.