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This paper presents a web service and HLA based multidisciplinary collaborative approach for complex product design in distributed network environment. A HLA and Web service based framework to support multidisciplinary modeling and collaborative simulation is presented. Then Its key modules including session manager and service encapsulation are discussed. The framework supports collaborative designing on heterogeneous platforms. A typical prototype system of locomotive development supporting collaborative simulation is implemented to verify the feasibility of our solution. The experimental results shows that Web service and HLA based approach can effectively support collaborative design under the distributed M&S environment.