Abstract: A high-altitude balloon design system based on a new framework was developed. The design theory of integration,opening source and multi-object contrasting were imported. Meanwhile, the object-oriented method was used to conform the data. The project could be designed by using the opening function of user-defined developing and baseline comparing of multi-agents.The examples prove that the high-altitude balloon design system can synthetically estimate the analyzing results of model establishing,capability and cost evaluating.And the system can combine the pratical applications such as schematic design, digital manufacturing and flight simulation together.