Abstract: There is a vast area of azalea(Rhododendron spp.) forest in Northwest Guizhou Province,At flowering season in summer, it becomes a region of tourist attraction. This region is so fascinating that people call it "Hundred Li(500m)Azalea Forest". It has a great value for ecology and tourism to exploit and develop the azalea forest.The soil ecplogical conditions in this area are studied by means of correlation analysis between soil types and vegetation groups. the soil of this area can be divided into 8 types. There are 21 objective items,especially pH value,exchangeable bases and total acidity,which exert significant influ-ence on the growth of Rhododendron.