The　authors　report　a　detailed　case　study　of　energy　response　on　three　dimensional　(3D)　Reinforced　Concrete　(RC)　moment　resisting　frame　(MRF)　structures　for　hysteretic　energy　distribution　rule.　An　RC　MRF　structure　was　adequately　aseismatic　designed,　based　on　which　three　additional　various　stiffness　distributed　models　were　conceived.　With　3D　translational　earthquake　records　input,　nonlinear　dynamic　analysis　was　carried　out　on　them.　It　was　revealed　that　for　3D　RC　MRF　structures,　seismic　hysteretic　energy＇s　vertical　distribution　was　different　from　assumptions　as　revealed　in　literature.　When　the　structure　has　the　same　vertical　stiffness　distribution　change　to　obvious　descending　stiffness　distribution　from　top,　the　hysteretic　energy　distribution　rule　was　proposed　that　for　beam　it　will　change　from　lognormal　type　to　parabolic　type,　and　＂steep　reduction＂　to　＂mitigatory　reduction＂　for　column.　Therefore,　for　different　type　of　element,　especially　column,　the　amount　of　seismic　energy　it　dissipated　may　thoroughly　different　from　what　it　was　supposed.　Designers　and　researchers　must　be　aware　of　this.