Effects of different intercropping systems of corn and different varieties of green manure on crop yield and economic benefit were studied by the field experiment in Hexi oasis irrigation area.The results showed that corn biomass and grain yield were the highest under the planting system of three rows of corn intercropping two rows of needle leaf pea,the biomass and grain yield were respectively higher by 0.2% and 0.95% than that of no intercropping treatments,but their difference was not significant.The yield of green manure hay was the highest under the planting system of two rows of corn intercropping three rows of hairy vetch,the average yield of two years was 3 901 kg·hm-2 significantly higher than other treatments.The legumes grain yield of green manure was the highest under the planting system of two rows of corn intercropping three rows of needle leaf pea,the average yield of two years was 2 225 kg·hm-2 significantly higher than other treatments.The economic benefit was the highest under the planting system of three rows of corn intercropping three rows of needle leaf peat,reached 35 038 yuan·hm-2,compared with the two rows and three rows of corn no intercropping green manure treatments,the economic increased 7 848 yuan·hm-2 and 5 853 yuan·hm-2,the income increased by 2886% and 2005%,respectively.Thus,the highest corn grain could be harvested by the optimal planting system of three rows of corn intercropping two rows of needle leaf pea in Hexi oasis irrigation area;the best economic benefit could be obtained by the planting system of three rows of corn intercropping three rows of needle leaf pea in Hexi oasis irrigation area.