Abstract: This technology of plastic film mulching was applied in faba bean, to effectively integrated‘Qinghai No.13’into the rained agricultural system, and improving the production capacity. It is important for effectively expanding the broad bean planting area in Qinghai. In arid agricultural areas plastic mulching and bareness planting was used and analyses the yield-increasing effect of‘Qinghai No.13’plastic mulching. The results was showed that the plastic mulching improved significantly soil temperature and soil moisture in plough player, the average soil temperature increased 2.4℃, soil moisture increased by 14.1%. It is good for cultivating strong seedling and growth, made growth period earlier about 1 week. The dry matter accumulation was increased significantly by 148.14% in maturity of‘Qinghai No.13’. Number of pods per plant, grain number per plant and yield increased respectively by 121.7% , 87.4% and 87.4% , so that the yields of ‘Qinghai No.13’was increased by 23.55% after plastic mulching cultivation.