Design of aerospace environment simulation numerical model

To resolve the aerospace environment numerical simulation problems, such as the calculation model singularity, the bad program transplant, unsatisfactory adaptability, this paper advances the COM-based simulation toolkit (SESTK) that is fit for user expanding. Based on the OO(Object-Orientation) method and COM, it uses UML to design system and function, integrates and normalizes the dispersive kinds of space environment numerical models that run in the different systems. And it collects the space environment elements calculation models, the correlation program, the expanding data and the sun-magnetic index database. It affords the well using and expanding interface in order to integrate with other simulation softwares.