The　serious　waste　and　less　utilization　of　water　resource,　the　problem　of　low　utilization　rate　in　our　country　is　always　the　bottleneck　in　the　development　of　society　in　twenty　first　Century.　Rational　water　resources　quality　evaluation,　the　water　quality　classification,　selection　of　reasonable,　accurate　method　of　determining　the　groundwater　quality　is　precondition　of　improving　water　resources　utilization.　To　make　an　accurate　assessment　of　groundwater　quality,　the　choice　of　evaluation　methods　is　critical.　Selecting　total　hardness,　chloride,　sulfate,　nitrate,　iron,　potassium　permanganate　index　six　important　evaluation　factors,　using　the　comprehensive　evaluation　method　and　fuzzy　mathematics　method　evaluates　water　quality　status　of　representative　four　wells　in　certain　region　respectively.　The　results　show　that:　two　kinds　of　methods　can　meet　the　precision　requirement,　comprehensive　evaluation　method　boundary　is　very　strict,　not　considering　each　sample　ions　composition,　extremal　function　too　obvious.　But　the　method　of　fuzzy　mathematics　comprehensive　considering　wells＇　each　ion　composition,　eliminating　extreme　qualitative　effect,　the　evaluation　results　is　more　objective.　From　human　health　perspective,　the　single　index　exceed　the　standard　is　not　conducive　to　health,　drinking　water　quality　evaluation　must　consider　the　extreme　value　problem.