Abstract: A soil survey was made on differentiation of the fertility of forest soil with statistical method so that some basic data were collected for promoting the production of poor forest stands. The findings of the nitrogen and organic matter, the degree of forest site slope, the positions and aspects of the slope, and the phosphorus pentoxide through principal component analysis were proved to be important factors, and the differences indicated by the four types of soil fertility obtained from cluster analysis are of grcat consequence in rational use of soil resources and practice of diversification in forestry.