The flexible inflatable wing has become a hot research focus both at home and abroad for its unique advantages such as small folding volume, light weight, portability, easy transportation, rapid deployment, low cost and high reliability. However, because the flexible inflating wing is the skin film structure, the overall modal characteristics of the wing are affected by the coupling effects of the film material properties, structural forms, inflation pressure, and many other factors. The multi-air beam aerated wing is taken to construct the mechanical model and the structural modal analysis model. And the first 10 modal frequencies and shapes were solved by ABAQUS linear perturbation. It was found that with the increasing of the modal order, the natural frequency of the system increased significantly, and the mode shapes also increased as well showing a positive correlation. Moreover, the first six modes are mainly the one-span and one-way changes, but from the seventh mode, the modes mainly develop toward the span. The influence of different elastic moduli on the modal characteristics was also studied, and the results confirmed the correlation between the frequencies and mode values of each order was basically the same, which provides an effective method for the inflation mechanics analysis and design of the flexible inflatable structure.