Acknowledgments:TheresearchissupportedbyNationalNaturalScienceFoundationofChina(No.51679259andNo.51725902).Abstract:Riverswithgoodconnectivityareconducivetothedevelopmentofvariousfunctionsofrivers,suchashydrologicalregulationandstorage,waterandsedimenttransport,andecologicalenvironment.HumanactivitieshavegreatlyreducedthesedimentloadintheYangtzeRiverBasinandhavechangedthechannelconnectivityoftheJingjiangRiver.Inthispaper,theanalytichierarchyprocess(AHP)isusedtoestablishtheassessmentmodelofchannelconnectivitybasedontheriverfunction.Then,combinedwiththeflow,sedimentandboundarydataofthemainhydrologicalstations,weanalyzethevariationinprocessesofthechannelconnectivityoftheJingjiangRiverfrom1955to2015.TheresultsshowthatthechangeinprocessofchannelconnectivityoftheJingjiangRiverisbasicallythesamein different reaches.Thevalueofthecomprehensivefunctionofconnectivityincreasesgraduallywithtimeandisgreaterthan1.0after1990,indicatingthatthechannelconnectivityhasimproved.Spatially,theShashi-Jianlireachhasthebestconnectivity,whiletheZhicheng-Shashireachhastheworstconnectivity.Inaddition,reservoirconstructionandriverstraighteningarethemainfactorsaffectingthechannelconnectivityoftheJingjiangRiversystem.Soilandwaterconservationchangesthechannelconnectivitybychangingthewaterandsedimentyield,whichisthesecondaryfactor.Thestudymeans,methodandachievementareuniversallyapplicabletotheevaluationofotherchannelconnectivity.Keywords:connectivity,Jingjiang,rivererosion,reservoirregulation