The function of the maxillary plane guide plate is to separate the upper and lower posterior teeth without contact when the lower anterior teeth bite on the plane guide plate, so as to increase the distance between jaws, lengthen the muscle fibers in the maxillofacial region, increase the muscle tension, and reflexively close the mandible, so that the contraction force of masticatory muscles is concentrated in the mandibular anterior teeth area and depress the anterior teeth, thus avoiding the difficulty of flattening Spitzer curve of the posterior teeth due to occlusal disorder and looseness, especially in backward inclination.