Based on NACA2412 airfoil, the improved stress expression model established by considering the influence of distribution mass can achieve the allowable range of inflation pressure of the flexible film wings. The results show that smaller the size of the flexible wing inflatable units are, the greater the allowable range of the inflation pressure can be. ABAQUS/CAE software was used for simulating the stress and deformation of flexible aerated wing under different inflation pressure conditions. The unique way of warping of asymmetric airfoil after inflating was found. The risk points of flexible skin were determined. The typical lines were used to analyze the local mechanical properties of the inflatable wing. The improved inflatable wing with surface coating obtained a good effect of improving the structure mechanical properties.