This　paper　introduced　the　auxiliary　magnetic　force　based　on　the　bistable　piezoelectric　cantilever　beam　in　order　to　improve　the　voltage　output　of　the　bistable　piezoelectric　cantilever　beam.　The　influence　of　the　auxiliary　magnetic　force　on　the　complex　nonlinear　dynamic　responses　of　the　bistable　piezoelectric　cantilever　beam　was　studied.　The　experiment　structure　was　a　symmetric　laminated　beam.　The　material　of　the　piezoelectric　layer　was　PVDF,　and　the　material　of　the　basic　layer　was　brass.　The　excitation　of　the　piezoelectric　cantilever　beam　was　the　harmonic　excitation.　The　jump　phenomenon　was　studied　by　the　forward　sweep　frequency　and　the　reverse　sweep　frequency　of　the　voltage　and　displacement.　The　effect　of　longitudinal　auxiliary　magnetic　force　on　the　chaotic　motion　of　the　system　was　researched.　Experimental　results　showed　that　when　the　distance　between　the　auxiliary　magnet　and　the　primary　magnet　is　large,　the　bistable　system　exhibits　obvious　hard　spring　characteristic.　When　the　distance　between　the　auxiliary　magnet　and　the　primary　magnet　is　small,　the　bistable　system　exhibits　obvious　soft　spring　characteristic.　In　addition,　when　the　distance　between　the　auxiliary　magnet　and　the　primary　magnet　is　small,　the　nonlinear　dynamics　of　the　system　tends　to　be　rich　and　complex.　©　2015,　Beijing　University　of　Technology.　All　right　reserved.