河西属于荒漠、半荒漠干旱气候,大气降水和河水流量是水资源的主要部分。随着河西商品粮基地的建立,水资源利用问题日益突出。在干旱的灌溉农业区,仅仅根据降水和流量的多少,不考虑作物正常生长发育对水分的要求,还不能正确讨论水分的农业潜力和评价水资源的优劣。因此,为了正确的分析河西地区的水资源,评价农业水分供应的好坏,本文试图用桑斯维持方法来计算河西各地农田水分蒸散量。在此基础上估算春小麦、玉米作物的水 Hexi is a desert, semi-desert arid climate, precipitation and river water flow is the main part of water resources. With the establishment of Hexi commodity grain base, the issue of water resources utilization has become increasingly prominent. In arid irrigated agricultural regions, the agricultural potential of water and the evaluation of water resources can not be properly discussed, simply based on the amount of precipitation and flow, regardless of the water requirements for normal crop growth. Therefore, in order to analyze the water resources in Hexi Corridor correctly and to evaluate the quality of agricultural water supply, this paper attempts to calculate the evapotranspiration of farmland around Hexi by Suns method. On this basis, estimate the spring wheat, corn crop water