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The High Level Architecture (HLA) has been followed universally as a de facto standard for modeling and simulation. However, the design of HLA was not intended to manage simulation demanding resources from various organizations. At the same time, the resources of a distributed simulation can not be dynamic mapped during the process. The advantages of Grid service in collaborating and managing distributed resources provide a new opportunity to solve these problems. In this paper, a distributed simulation framework is proposed. The framework, based upon Grid service, extends HLA/RTI to Wide-Area-Network (WAN), and it can combine the advantages of both Grid service and HLA. Using this frame work, we provide a platform for traffic emergency response simulation over WAN. The results of experiments of the prototype show the feasibility and efficiency of this framework. The future research plan has been discussed in the end.