In order to explore the resource of rain-fall under rain-fed regions of wheat-summer corn planting system,it is useful measures to combine bed-planting and strew mulching for improving water use efficiency(WUE).The experiment showed the summer corn cultivation of combinating bed-planting with strew mulching markedly increased the amount of soil water storage from 0~40 cm deep soil profile,especially in the scope of 5~10 cm,in contrast with the flatting cropping system.But the effects gradually decreased as soil profile extended deeply.The average value of free vaporizing on the top of corn population was 12.8%,7.6%,13.2% for the treatments of sole cropping with mulching,bed-planting,combinating bed-planting with mulching,respectively,in comparison with the treatment of sole cropping,but the average value of ground vaporizing 48.6%,29.9%,54.3%,respectively.The system of bed-planting and mulching improved WUE by 24.32%,and the rate of leaf losing water was the lowest among the four treatments.The results implicate that the pattern of bed-planting and mulching can effectively storage rain fall,and translate the soil water resource into plant water available at most.