A　coupling　numerical　simulation　method　of　CFD/CSD　is　presented.　Taking　lift　force　characteristics　as　a　restriction　design　object,　the　coupling　aerodynamic　and　structural　design　optimization　on　the　configurations　of　lightweight　F4　models　manufactured　by　Stereo-Lithography　(SL)　was　accomplished.　Six　design　optimization　configurations　of　the　models　were　conducted　by　utilizing　the　self-created　program　optimization　of　response　surface　methodology.　The　models　with　different　wing　configurations　optimization　were　fabricated　by　SL　technique.　The　results　indicate　that　the　lift　force　characteristics　of　the　models　are　accord　with　the　overseas　results　including　static　aero-elastic　modification,　especially　that　the　experimental　results　of　6#　model　present　that　the　wings＇　deformations　are　in　three-dimensional　directions,　which　shows　the　coupling　aerodynamic　and　structural　design　optimization　method　is　feasible.　The　method　can　provide　some　fundaments　and　supports　for　the　application　of　lightweight　models　based　on　SL　for　high-speed　wind-tunnel　test,　also　can　give　some　suggestions　and　thoughts　to　study　coupling　aerodynamic　and　structural　design　optimization　for　aircrafts　based　on　some　aerodynamic　parameters　and　static　aero-elastic　modifications　on　aerodynamic　data　obtained　in　the　experiments.