In　order　to　increase　the　output　voltage　of　piezoelectric　energy　harvesting,　this　paper　mainly　discusses　bi-stable　plates　for　piezoelectric　energy　harvesting,　and　its　property　is　analyzed　with　finite　element　analysis.　The　device　changes　kinetic　energy　into　electrical　one,　whose　core　part　comprises　a　substrate,　a　piezoelectric　layer,　mass　block　and　the　electrode.　The　research　focuses　on　firstly　examining　the　effect　of　the　area　of　piezoelectric　layer,　the　temperature　and　the　mass　block　on　the　natural　frequency　of　the　system,　and　then　analyzing　the　effect　of　laying　type　and　area　of　piezoelectric　layer　on　the　output　voltage　of　the　system.　Eventually　a　new　structure　of　bi-stable　piezoelectric　energy　harvesting　is　put　forward　to　improve　its　harvesting　efficiency.　This　conclusion　can　be　used　to　provide　a　theoretical　basis　for　application　of　piezoelectric　technology　in　engineering.　©　Published　under　licence　by　IOP　Publishing　Ltd.