根据四川九寨沟和冶勒地区各种水体的同位素资料 ,讨论了反映大气降水蒸发、凝结过程的不平衡程度的氘过量参数 (d=δD- 8δ1 8O)在降水和地下水中的主要变化特点及影响因素 ,对比了岩溶水和非岩溶水中氘过量参数 d值的变化情况以及与水体氚含量变化的相关规律性。指出氘过量参数 d值 ,是研究水 /岩作用、地下水动力学和地表径流动态组成的一个十分重要的参数指标 ,具有极为重要的水文地质学意义 Based on the isotopic data of various water bodies in Jiuzhaigou and Yele areas in Sichuan, the main characteristics and effects of deuterium excess parameters (d = δD-8δ180) that reflect the degree of imbalance of atmospheric precipitation evaporation and condensation are discussed Factor, the change of deuterium excess parameter d in karst water and non-karst water and the correlation with the change of tritium content in water were compared. Pointing out the d value of excess deuterium is a very important parameter index for studying the dynamic composition of water / rock, groundwater dynamics and surface runoff, and has extremely important hydrogeological significance