To　study　the　mechanical　behavior　of　double-layer　toughened　sandwich　glass　with　two-side　simple　support　under　out-of-plane　bending,　a　total　of　sixty-four　specimens　with　different　test　parameters　were　experimentally　investigated　in　this　paper.　The　main　parameters　of　specimens　include　thickness　of　single　layer,　supporting　width,　and　loading　length.　It　was　demonstrated　that　the　specimens　failed　with　all　pieces　of　cracks　combined　together　as　an　entire　unit　rather　than　to　separate　into　a　large　number　of　glass　fragments.　What＇s　more,　the　cracks　appeared　only　in　the　lower　layer　of　the　toughened　sandwich　glass,　extending　in　a　way　similar　to　the　spider　web.　The　ultimate　bending　strength　and　bending　stiffness　of　the　toughened　sandwich　glass　are　enhanced　with　the　increase　of　the　thickness　of　single　layer,　the　supporting　width,　and　the　loading　length.　Among　the　above　parameters,　the　thickness　of　single　layer　plays　a　leading　role　in　enhancing　the　ultimate　bending　strength　and　bending　stiffness　of　the　toughened　sandwich　glass.　Nevertheless,　the　supporting　width　only　has　a　slight　effect　on　improving　the　ultimate　bending　strength　and　bending　stiffness.　Based　on　the　bending　theory　of　thin　plates,　the　simplified　design　formulas　were　presented　to　evaluate　the　ultimate　bending　strength　of　double-layer　toughened　sandwich　glass　with　two-side　simple　support　under　out-of-plane　bending,　which　was　verified　to　be　reasonable　and　accurate.