在分析陕北、渭北地区旱地冬小麦生育期水分盈亏量和不同月份降水自给率地区分异的基础上 ,研究了不同分区典型县旱地降水产量积分回归函数和降水对产量的影响规律 ,确定了陕西丘陵沟壑区和渭北台塬东部冬小麦最佳补充灌溉时期为 :冬前分蘖期和返青、拔节期 ;洛川塬区 :返青、拔节期 ;渭北台塬西部 :越冬期 Based on the analysis of the regional differences in the profit and loss of winter wheat and the degree of self-sufficiency of rainfall in dry land in northern and northern areas of Weibei, this paper studied the integral regression function of precipitation and the effect of precipitation on the yield of dryland in different districts. The optimal irrigation periods for winter wheat in the hilly and gorges areas of Shaanxi and the eastern Weibei Plateau were as follows: tillering and rejuvenation and jointing stage before winter; Luochuan highland: rejuvenation and jointing stage; western part of Weibei Plateau: wintering period