This　paper　focuses　power　generation　and　nonlinear　dynamic　behaviors　on　a　new　bistable　piezoelectric-electromagnetic　energy　harvester.　Three　different　kinds　of　piezoelectric　cantilever　beam　structures,　which　include　the　monostable　piezoelectric　cantilever　beam,　the　bistable　piezoelectric　cantilever　beam　with　spring　and　magnet,　and　the　bistable　piezoelectric　cantilever　beam　with　spring,　magnet,　and　coil,　are　designed.　The　power　generation　efficiency　and　dynamic　behaviors　for　each　structure　are　experimentally　studied,　respectively.　Due　to　the　spring　introduced,　the　system　easily　goes　through　the　potential　barrier.　Experimental　results　show　that　the　power　generation　structure　of　the　bistable　piezoelectric-electromagnetic　harvester　can　vibrate　between　two　steady　states　in　a　wider　range　of　the　frequency.　Therefore,　the　effective　frequency　bandwidth　is　broadened　about　2　Hz　when　the　spring　is　introduced　under　the　condition　of　the　suitable　magnetic　distance.　Comparing　with　the　power　generation　efficiency　for　three　different　kinds　of　structures,　it　is　found　that　the　bistable　piezoelectric-electromagnetic　harvester　has　the　optimum　characteristics,　which　include　the　optimal　magnetic　distance　of　15　mm,　the　optimal　load　of　8　M　Omega,　and　the　parameters　variation　law　of　coils.　For　this　structure,　the　influences　of　the　external　excitation　and　the　magnetic　distance　on　the　output　voltage　and　dynamic　behaviors　of　the　system　are　examined.