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There are two problems in the existing rendering platforms that support HLA-based simulation applications. One is the fact that the management of simulation entity objects and the management of rendering scene objects are separate, which leads to inefficiency in simulation and rendering. Another one is absence of rendering interface, especially for parallel rendering for users. In order to solve the above problems, we present a unified object model supporting HLA-based simulation and parallel rendering, which consists of heterogenous scene graph tree, action list and universal access interface. The Unified object model establishes an efficient data exchange bridge between HLA simulation and parallel rendering. Therefore massive complex scene and large quantity of simulation entities can be organized and managed in a unified form. An experimental demo is given at the end of this paper.