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A certain missile has complex components and constituting. It belongs to technology intensive and complex system. In order to shorten the repair time,improve the repair efficiency purpose,we need to train repair personnel and engineering testing personnel through the way of computer simulation. To realize this purpose we need to establish a comprehensive,real fault simulation system. Through the analysis and modeling of fault modes,fault model introducing the work completed in system simulation model,thus we get a set of simulation training system,and the simulation of reappearing fault is performed in the training system. From the repetition of results,the set of simulation training system can reflect the actual response of the product in the failure mode.