Abstract: The assessment of the groundwater function has widely been developed for the neglect problems of groundwater ecological and geological environment from inconsequence exploitation of groundwater in North China.But there are some problems to understand and choose the attribute index of the assessment system of the groundwater function,which have important effect on the assessment results.To understand and choose the attribute index is much important for the assessment result because the attribute index is the core index of the assessment system.If understanding and choosing the attribute index is in error,the assessment results of the groundwater function will not be truth.The constitution,primary concepts,characteristics and meaning of the attributive index of groundwater function assessment system have been expounded at large in this paper.