Groundwater　pollution　seriously　threaten　the　environment　if　controlling　steps　are　not　implemented　immediately,　groundwater　quality　evaluation　is　one　of　the　significant　means　to　solve　these　problems.　As　impacting　factors　that　are　evaluated　their　influences　on　groundwater　pollution,　weights　of　indicators　and　attributes　are　determined　by　the　Analytic　Hierarchy　Process　(AHP)　method　which　is　performed　by　matrix　calculations.　Considering　defects　of　the　method　for　sorting,　Improvement　on　the　sorting　method　will　be　made.　Then,　combines　the　weights　that　respectively　determined　by　the　AHP　method　and　by　the　improved　AHP　method　with　the　fuzzy　membership　degree,　to　evaluate　the　level　of　groundwater　quality.　The　method　not　only　overcomes　deviations　of　personal　opinion　for　experts,　but　also　avoids　errors　brought　by　fuzzy　uncertainty;　Contrast　with　these　two　kinds　of　evaluation　methods,　the　improved　AHP　method　can　be　more　successful　to　sort　the　factors,　example　of　application　testified　the　reliability　of　above　method.　©　2013　Taylor　&　Francis　Group.