The use of outer space is an industrial field that is expected to expand in the future, and the weight reduction of rockets, which are the means of transporting cargo there, is an important R&D theme that will lead to reducing transportation costs. In the guest chair for advanced interdisciplinary modeling,we are considering weight reduction by applying carbon fiber reinforced plastics (CFRP) to the propellant tank, which accounts for a large part of the rocket structure, by examining manufacturing processes, developing materials, and developing structural design methods. We are also studying not only weight reduction but also cost reduction of the product by implementing a manufacturing process that does not require expensive manufacturing equipment such as an autoclave and its automation to reduce manufacturing costs, and by developing materials suitable for the automated process. We believe that this technology can be applied not only to rockets but also to fuel cell vehicles, etc., and can contribute to improving the capabilities of future transportation systems.