A kind of K drought index and its criterion are made by using spring precipitation and evaporation data of 140 stations in Northwest China from 1971-2000.
用西北地区140个气象站1971～2000年的春季降水、蒸发资料，计算了一种K干旱指数，并制定了干旱标准，分析了西北春季干旱的气候特征。
Thismethod is also suitable for monitoring drought and estimating yield loss of wheat in dry farming areas in northwest of China.
该方法适用于中国西北旱作小麦的干旱监测与灾损评估。
This paper analyzes the problem of water shortage in northwest regions of China, and proposes that natural change is the main reason that causes the meteorological drought;
对西北地区缺水问题进行了分析，认为西北地区的气候干旱主要是自然变迁造成的；
应用推荐