In this study, we proposed partially rigidizable inflatable structures consist of rigidizable layers on the part where to be stiffened. As a result of tension test of the test specimen, we could make the property of the material clear. Furthermore, we made a initial model that wholly covered hemisphere structural model and the topology optimization was applied to find the optimum arrangement of regidizable layers. As a result, the number of edge reduced to 35 lines, and considering the volume to 11% lower than that of the basic model. From the point of view of manufacturing, stiffness and stress concentration, we could suppose that the basic model is suitable for our required.