| This thesis focused on the study of plant diversity, spatial variability of site factor, site quality evaluation in Yuntai Mountain in Lianyungang. The main results were as follows:(1) The important value, Shannon-wiener index, Simpson index, richness index, Pielou evenness index and Sorensen similarity coefficient were applied to study the plant diversity. Phyllostachys varioauriculata was the most in shrub layer, and the important value of Carex pallens was the highest in herb layer. Most plant diversity indexes of herb layer were higher than those of shrub layer. Sorensen similarity coefficient showed that the nearer the research plots, the more the same plant species they shared. In the four site factors of slope, exposure, soil thickness and elevation , Only the elevation influenced plant diversity in herb layer.(2) Organic presented a significant positive correlation with total N and available N which indicated that the concentration of N increased according to the increase of organic. K value of the anti-erosion had negative correlation with organic. It was the reason that increase of organic concentration would obviously improve the physical, chemical properties of soil and the anti-erosion.(3) According to scores of site macroscopical factors, 22 regions were divided into three categories. The main feature of the first category was that the soil layer was the thick with relatively good evaluaton. The soil layer of the second category was the middling on thickness, with general evaluation. The third category was very thin with the poor evaluation. On this basis, each category was again divided into one or two sub-categories according to evaluation of soil quality.
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