Bimodulous　elliptical　plate　could　form　compression　and　tensile　area　under　external　loads.　Bimodulous　elliptical　plate　is　regarded　as　laminated　plate　composited　of　two　kind　of　orthotropic　materials.　Static　equilibrium　equation　of　bimodulous　elliptical　plate　under　the　external　loads　is　established　by　using　elasticity　theory.　The　location　of　neutral　plane　in　bimodulous　elliptical　plate　is　determined　by　the　utilization　of　static　equilibrium　equation.　The　nonlinear　bending　deformation　differential　equations　of　bimodulous　elliptical　plate　is　derived,　and　the　deflection　function　of　bimodulous　elliptical　plate　is　got.　Through　the　FEM　analysis　of　elliptical　plate,　the　correctness　of　the　method　is　verified.　The　main　conclusions　are　as　follows:　the　deflection　and　moment　calculation　of　elliptical　plate　with　larger　difference　between　tensile　elastic　modulus　and　compressive　elastic　modulus　should　base　upon　the　elasticity　theory　with　different　elastic　moduli　in　tension　and　compression　but　not　the　classical　elasticity　theory　with　same　elastic　modulus.