On 15°sloping field in dry areas of south Ningxia province, the crop yield, morphological index, water use efficiency and soil erosion characteristics were researched about seven different types of strip intercropping of grain-grass (Millet and Alfalfa) and sloe cropping of grain (Millet) during May 2007 to October 2008. The results were showed that: Compared with sloe cropping of grain, other seven different types of strip intercropping of grain-grass(4∶4, 4∶6, 6∶4, 6∶6, 6∶8, 8∶6, 8∶8) increased leaf area and quality of single plant significantly. The intercropping of grain-grass patterns increased crop water use efficiency by 0.99kg/m3-1.57kg/m3 and crop yield by 3.02%-15.72%, decreased surface runoff by 6.86% - 58.42% and sediment runoff by 56.09%-100%. Among different types of strip intercropping of grain-grass, the strip of intercropping of grain-grass was more narrower, the effects of crop yield increase and soil erosion control was more better. Consolidated comparative results of different intercropping grain-grass patterns was that the three types of 4∶4, 4∶6 and 6∶4 were the best intercropping pattern.