Although　single-layer　sandwich　materials　have　been　extensively　studied　in　the　engineering　field,　multilayered　sandwich　structures　have　rarely　been　concerned,　especially　on　their　dynamic　analysis　or　vibration　control.　In　this　study,　the　dynamics　of　a　double-layer　hourglass　sandwich　beam　is　investigated　by　an　improved　method　developed　to　simplify　the　calculations.　The　active　vibration　control　is　also　analyzed.　By　using　Hamilton＇s　principle,　the　governing　equations　are　derived　and　the　natural　frequencies　are　calculated　by　our　improved　method.　The　results　have　been　validated　by　comparing　with　the　data　obtained　by　traditional　method,　and　finite　element　method.　The　contributions　of　both　structural　and　material　parameters　on　the　dynamics　of　the　double-layer　sandwich　beam　are　also　investigated.　The　velocity　feedback　control　method　is　employed　to　act　as　controllers　on　vibration　suppressing　of　the　sandwich　structure　actively.　Further,　nonlinear　energy　sink　is　used　to　control　the　vibration　of　the　sandwich　structure　passively.