Abstract: In order to evaluate the water abundance of the target aquifer and solve the problem that previous evaluation methods can not effectively reflect water abundance zoning.On the basis of making full use of geological and hydrogeological data,a water abundance evaluation index system of aquifer was established,which was mainly controlled by five indexes,namely,unit inflow,permeability coefficient,thickness of aquifer,core recovery and thickness ratio of brittle plastic rocks.The fuzzy comprehensive evaluation method based on maximum subordination principle was applied to perform water abundance evaluation zoning of aquifer.The theory of degree of validity was introduced to test the validity of the evaluation result of maximum subordination principle,the weighted average principle was adopted to reevaluate the untrusted region,and finally the evaluation result of water abundance in the whole region was determined.The results show that the fuzzy comprehensive evaluation method based on validity is feasible to evaluate the water abundance of aquifer,and it provides a new method for the water abundance evaluation.