Currently,　tank　diaphragms　are　mostly　applied　in　the　field　of　aerospace　but　one　of　their　limitations　have　to　do　with　their　inability　to　recycle.　In　the　article,　we　discussed　the　modeling　of　a　new　kind　of　reversible　diaphragm,　so-called　shape　memory　polymer　(SMP)　diaphragm.　A　thermo-mechanical　modeling　of　SMP　is　implemented　by　the　finite　element　method　using　a　constitutive　model.　A　single　variable　in　this　model　is　defined　and　used　to　simplify　the　model　compared　to　other　existing　models.　Evolution　of　the　analysis　is　conducted　by　making　use　of　the　intermediate　difference　forms　and　Jacobian　matrix,　which　is　applied　to　all　quantities　within　the　model.　The　overturning　and　recovery　behaviors　of　the　SMP　diaphragm　are　examined.　And,　the　effect　of　several　parameters,　including　thickness,　height　and　radius　of　the　diaphragm,　as　well　as　temperature　on　the　overturning　performance　are　investigated.　This　study　led　to　the　establishment　of　an　optimized　model　with　the　objective　function　requiring　minimum　overturning　pressure　for　completing　deformation　and　design　variables　associated　with　thickness,　height,　radius,　and　temperature.　An　optimized　SMP　diaphragm　is　obtained　under　the　critical　pressure　constraints.　The　results　contribute　to　the　design　and　application　of　novel　SMP　diaphragms.　(C)　2018　Wiley　Periodicals,　Inc.