This　article　describes　design　and　analysis　of　a　novel　reversible　diaphragm　using　shape　memory　polymer.　The　reversible　diaphragm　could　be　applied　to　space　engineering,　such　as　propellant　tank　of　rocket.　The　shape　memory　polymer　diaphragm　can　automatically　recover　to　the　initial　state　after　the　overturning　deformation　and　thus　can　be　used　repeatedly.　A　three-dimensional　model　is　established　to　study　the　overturning　and　recovery　behavior　of　the　shape　memory　polymer　diaphragm.The　nonlinear　finite　element　method　based　on　the　thermodynamic　constitutive　equations　of　shape　memory　polymer　is　used　to　obtain　pressure　-displacement　relations　and　strain　energy　variation　of　SMP　diaphragm　with　approximately　hemispherical　shape　in　the　whole　process　of　the　overturning　deformation.　The　influence　of　structural　parameters　and　temperature　on　the　overturning　and　recover　behavior　is　discussed.