Estuarinesystemsareconsideredasatypicalecotone,andanestuarinefishcommunitystudyisconsideredtobeafundamentalecologicalresearchstudy.Fourfacets(numberofspecies,Pielouevenness,taxonomicdistinctnessandaveragetaxonomicdistinctness)ofcommunitydiversitycharacteristicsstructuringbyspecieslevel,abundance,binarydataandclassificationlevelswereanalyzedwithintheYangtzeRiverestuary,China,whichisdividedintothreezones(Zone1,Zone2,andZone3)alongtheestuarinegradient.Fishsamplingwasconductedusingbottomtrawlingseasonallyfrom20102011.Theresultsshowedthatallfourdiversityparametersdidnotdiffersignificantamongseasons.However,numberofspeciesandaveragetaxonomicdistinctnessbothdifferedsignificantlyamongthedifferentzones.AnincreasingtrendinmeannumbersofspeciesfromZone-1(3.49species)Zone-3(10.13species)wasrelatedtothestrongermarineinfluenceonthelatterzones.LowervaluesofaveragetaxonomicdistinctnessinZone-1suggestedthatmorespecieswerecloselyrelatedinZone-1thaninZone-2orZone-3,forexample,8,20,and19familieswererecordedinZone-1,Zone-2,andZone-3,respectively.Althoughspatialchangesintaxonomicdistinctnessandevennesswerenotsignificant,inversepatternsofthetwoparametersoccurred.Nevertheless,evennesspeakedinZone-1whereasmoreindividualswerecloselyrelatedinZone-1thaninZone-2orZone-3.Moreover,spatialpatternsincommunitydiversitywerestrongerthanseasonalvariations.Thismayreflectthatsalinityplaysthemajorroleindrivingtheestuarinefishcommunity.ThisworkanalyzedthefourfacetsofdiversityestimationsoffishcommunitywithintheYangtzeRiverestuary,andfurtherdemonstratedthatdifferentmeasuredparametersmayhighlightdifferentinformationregardingcommunitystructure,andwillbeusefulforassessingestuarinefishcommunitydiversity.