Technique of plant hedgerows is a favorable measure for utilization of slopelands and plays an important role in the sustainable development of eco-enviroment , resources and economy. Experiment s on the purple soil fer-tility of a plant hedgerows system were conducted on a slope cropland of 25 degree in the Three Gorges Reservoir area. Result s show that the plant hedgerow system is effective for soil fertility improvement . The root system of hedgerows is functioned as a“nut rient pump”to uptake soil nut rient s f rom deep soil and return them to topsoil by pruning of hedgerows , which promotes soil nut rient circulation and redist ribution. Runoff detention by hedgerows and mulching can effectively reduce soil nut rient loss by cont rolling soil loss and runoff.