This　paper　aims　to　analyze　snap-through　behavior　of　two-layer　cross-ply　bistable　composite　laminate　square　plates.　The　analyses　consider　the　factors　of　laminate　thickness,　temperature　and　external　applied　force.　In　this　study,　the　model　was　performed　on　the　basis　of　the　classical　thin　plate　theory,　the　Von　Karman　large　deformation　theory　and　Principle　of　Virtual　Work.　Afterwards　the　statics　equilibrium　equation　was　available.　Subsequently　the　analysis　was　presented　by　adjusting　the　laminate　thickness　for　these　prior　factors.　Through　the　numerical　simulations　with　Matlab　(R)　software,　the　curvatures　in　x-direction　and　y-direction　were　calculated　to　investigate　the　snap-through　behavior.　Two　stable　cylindrical　configurations　and　an　unstable　saddle　shape　were　given　with　different　curvatures　to　show　the　equilibrium　positions.　Then　the　figures　prove　the　external　applied　distributed　force　plays　a　vital　role　to　the　snap-through　behavior.　The　results　show　that　under　macroscopic　view,　the　ratio　of　side-length　to　thickness　is　three　hundred　or　less,　as　the　plates　are　thinner,　the　snap-through　will　appear　more　frequently,　and　the　external　forces　will　be　less　needed.