Based on the field experimental data of winter wheat and summer maize, the variation of leaf water potential and canopy-temperature discrepancy was an alyzed and used as the index of water stress.This index could vary with growing season and the characteristics of variation was considered. The relationship be tween leaf water potential, canopy-temperature discrepancy and soil water conte nt was found, and then the detection system of crop water stress was set up.%根据冬小麦、夏玉米田间试验结果分析了作物水分胁迫判别指标叶水势、冠层温度-气温差 变化规律，在充分考虑判别指标随作物发育期变化的特征基础上，提出了叶水势、冠层温度 -气温差反映土壤相对含水量的指标，并建立了作物水分胁迫监测系统，对指导生产实践具 有一定作用。
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