Visual Development Technology has been more and more attractive in the field of Modeling and Simulation with its intuitive features. As the scale of Parallel Discrete Event Simulation (PDES) enlarges, Researchers are becoming focused on how to integrate existing simulation entity models into PDES Application efficiently, by adopting the intuitive visualization technology. In this paper, the research status of the PDES visualization integration technology is discussed; and the authors have found the limitations of PDES visual integration technology, like the complex and not intuitive process of integration, the difficulty in reusing "basic integration module", and the difficulty in adjusting the application structure. Then a Visual integration approach for PDES Application based on Object-Interaction Graph was proposed for the "object interaction" features of PDES. This approach provides the developers with a more natural viewing angle with its more understandable graphical way, so that we can develop PDES Application more easily. The more flexible structure of PDES makes it possible to quickly adapt to the rapidly changing requirements of the simulation.
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