Abstract: The results of field experiments and breeding rabbit experiments in the past two years ( 1086-1988 ) showed that the alternation of culture of "one grass and three crops"in the two yearswas new way to utilize dryland in the case of incorating the leguminous grass and animal husbandry into cropping system.A net income of 8295 yuan per hectare could be obtained from the new cropping system, which provided 2800 yuan more per hectare of net income and 180 kg more per hectare of nitrogen than the simple planting grain system( wheat and sweet potato). The improvement of soil fertility would ensure the later grain to grow well.Even though the rotation of "grain crop-leguminous grass" had one grain harvest less than the rotation of "grain crop-grain crop" ,the total grain yield per hectare of the former (20358.5 kg per hectare)was 1539.2 kg higher than the latter(l8819.3 kg per hectare).