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The structural model of launch vehicle is fairly complex, so it is absolutely necessary to develop a special simulation analysis software for its high efficient and convenient analysis on dynamics. To ensure the practical nature on tool design, this software has been developed by Patran/Nastran which is widely used in aerospace applications. In consideration of the simulation analysis process, we have designed and implemented launch vehicle’s structural dynamic characteristics analysis tool with modeling and calculating module, results postprocessing module, mode selecting module and model modifying module. The involved key techniques are also summarized. It is verified by engineering practice that the tool has many advantages including high design efficiency, calculation accuracy, good generality and expansibility, thus provided with effective value in use.