In the study, we applied the theoretical spatial distribution model and 5 aggregation intensity indices to assess the spatial distribution pattern of Cyclobalanopsis multinervis in an evergreen broad-leaved forest in the Baishanzu National Nature Reserve. The results show that the shape of size structure of the C. multinervis population is pyramid with wide base and narrow top, which indicates the population is stable in this forest. The species bearing whole range of size classes shows regeneration fluctuation. Distribution patterns of the whole population and different growth stages of the species are clumped in general. The extent of aggregation reduces along with size class of trees, suggesting a loosing tendency to large trees for random distribution. The synthesized effect of species’ biological characteristics, habitat and environmental resources occupied, influences the population structure and distribution pattern of C. multinervis.