UPACS, Unified Platform for Aerospace Computational Simulation, is a project to develop a common CFD platform since 1998 at National Aerospace Laboratory of Japan. The project aims not only to overcome the increasing difficulty in recent CFD code programming on parallel computers for aerospace applications, but also to accelerate the development of CFD technology by sharing a common base code among research scientists and engineers. The latest UPACS can solve not only compressible flows around fuselages but also flows of rotating cascade, very low speed flows, and flows coupled with heat conduction in objects.