In order to study the mixture benefits of the mixed forest of Chinese pine with Chinese arborvitae, eight series of comparable sample plots of the mixed forest and its corresponding Chinese arborvitae forest are located on the slopes of different site conditions. It is found that the mixed forest has shown significant mixture benefits1. The mixed forest has more biological productivity in tree layer than the pure forest, but the undergrowth has less.The total community biomass of the mixed forest is more th...