Flight test on supersonic experimental airplane (NEXST-1) was conducted successfully by Japan Exploration Agency on October, 2005. A lot of aerodynamic data on the flight test were obtained. In this study those flight test data were compared with the numerical analysis to validate the design technologies. The effect of the additional parts, the aeroelastic deformation and boundary layer transition were taken into account in the CFD analysis for higher accuracy. Then this comparison highlighted the quantitative benefit of the natural laminar flow wing design concept.