Crossing loess plateau from south to north·wind erosion energy water erosion energy and gravity erosion energy attached with terrain are calculated in water erosion region, wind water erosion region and wind erosion region.The results indicate that in wind-water erosion region, wind erosion energy makes up the decrease of water erosion energy, wind erosion energy, water erosion energy and gravity erosion energy attached with terrain make wind-water erosion region be an area of high erosion energy environment and potential erosion intensity. With transition from water erosion region to wind erosion region total erosion energy increases, especially wind erosion energy increases abruptly.Additionally, the results also show that the fragility of earth surface in wind一water erosion region is the main course of severe soil erosion in this region.