An　analytical　periodic　model　is　developed　to　predict　the　radiation　of　sound　from　orthogonally　stiffened　laminated　composite　plates　under　airborne　and　structure　borne　excitations.　Whilst　a　layerwise　shear　deformable　theory　is　used　to　describe　the　vibration　of　the　base　plate,　both　the　force　and　moment　coupling　between　the　stiffeners　and　the　base　plate　are　considered　on　basis　of　flexural-torsion　coupling　equations.　The　periodic　governing　equations　are　solved　using　Fourier　transformation　method.　The　validity　and　feasibility　of　the　model　is　verified　by　comparing　theoretical　predictions　with　existing　numerical　and　experimental　results.　Numerical　discussions　with　the　model　demonstrate　the　significant　influence　of　both　flexural-extension　and　flexural-torsion　coupling　upon　acoustic　radiation　from　un-stiffened　composite　plate,　which　depends　on　material　properties,　geometrical　parameters　and　frequency.　(C)　2013　Elsevier　Ltd.　All　rights　reserved.