Hydrates　of　hybrid　organic-inorganic　perovskites　have　been　discovered　with　MAPbI(3)　and　are　proved　to　be　unstable　in　atmosphere.　However,　the　influence　of　water　molecules　on　the　performance　of　optoelectronic　devices　is　still　not　fully　understood.　Here,　using　a　dication,　2-(dimethylamino)　ethylamine　(DMEN2+),　a　stable　quasi-1D　perovskitoid　hydrate　single　crystal　is　designed　and　successfully　synthesized,　which　is　formulated　as　DMENPb2I6　center　dot　H2O.　In　this　design,　both　corner-sharing　and　edge-sharing　connectivity　are　adopted,　and　water　molecules　are　connected　with　the　crystal　through　hydrogen　bonding.　It　is　discovered　that　such　water　sites　distributed　along　the　inorganic　chains　function　both　as　charge　traps　and　as　releasable　charge　stocks.　Optical　excitation　that　overcomes　the　potential　wells　formed　on　these　water　sites　may　release　these　stocked　charges　and　facilitate　enhanced　transportable　charge　density.　Meanwhile,　exciton　diffusion　and　charge　transport　are　strongly　confined　in　the　1D　transport　channels.　Above　mechanisms　are　verified　both　by　the　transient　absorption　spectroscopy　and　by　the　photodetection　performance.　This　introduces　a　new　design　strategy　with　a　trapping-stock-releasing-transport　roadmap　for　perovskitoid　materials.　Excellent　water　resistance　endows　this　material　with　more　advantages　in　the　development　of　a　new　generation　of　optoelectronic　devices.