Abstract: A tropical monsoon climate with high temperature, abundant rainfall and strong typhoon prevails in the littoral hilly slopes in Dianbai county, Kwangtung. Thus the top soil is seriously eroded to leave the slopes bare and plate-like. Since the liberation, some preliminary results have been achieved after: the establishment of the artificial vegetations for more than 10 years. 1. The annual quantity of washed-off soil by water decreases from 15000 to. 2,945—4,400 M3/KM2. 2. The water table of the mixed forestof Pinus-Eucalyptus and the pure forest of Pinus are both lifted up distinctly. The annual difference of water level in the forested lands varies within 1 M, and that of the bare ground is 2.37 M. 3. The micro-climate also changes: the variation' range of the daily atmosphere. temperature decreases, the soil temperature decreases even more and the relative humidity of the atmosphere increases significantly. 4. The effect of soil improvement differs with the type of vegetation. So far as the soil fertility is concerned, the mixed forests are more effective than the pure forests. 5. A 466-hectare area of artificial vegetation in our county has effectively conserved the soil from erosion, thus ensured a high and stable yield of crops.