Geographic Information System is used in the paper. Spatial data with species of Fagaceae as attributes is composed of every county. Spatial distribution of genera is made. Spatial similarity coefficient is gotten. Spatial diversities and differences between genera in Fagaceae are analyzed. Formanodendron is a distributed area. It is different from other genera which are several scattered areas. Castanopsis, Cyclobalanopsis, Lithocarpus are more similar than other genera in spatial distribution. Their diversity centers have same place which is in the south of Yunnan. Diversity center of Fagus is more north than them. The southwest of Sichuan and northwest of Yunnan is diversity center of Quercus. The southeast region of Northwest China is an important road link between South and North China in Quercus.