Rebound　effects　of　a　blast　door　of　conventional　weapon　can　occur　under　blast　loadings　if　the　door　bears　high　opposite　stresses.　The　hinge　and　latch　can　be　destroyed　prior　to　the　damage　of　door　body　if　the　rebound　force　is　high　enough.　In　this　paper,　an　exact　analytic　model　for　the　rebound　effects　of　a　blast　door　is　derived.　All　factors　are　analyzed,　including　the　side-length　ratio,　duration,　damping　ratio,　loading　style,　and　negative　phase　of　blast　loading　etc.　The　results　show　that　the　peak　value　of　positive　and　negative　shear　forces　for　the　blast　door　are　gradually　reduced　with　increasing　side-length　ratio.　Furthermore,　the　damping　ratio　and　the　negative　phase　under　blast　loadings　can　hardly　affect　the　positive　shear　forces　and　even　their　effects　could　be　ignored,　but　they　show　a　strong　effect　on　the　negative　shear　force.　In　addition,　the　exponential　blast　loadings　play　an　important　role　in　determining　the　peak　value　of　both　positive　and　negative　shear　forces.