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According to the features of the flight visual simulation and the aerocraft, the imported mechanical model is reconstructed and optimized using Multigen Creator. In this paper ,the method of 3D modeling and optimization techniques are explored from the aspects such as adjusting the model database ,reducing the model complexity and size ,and so on ,and the contradiction of fidelity and the speed of visual simulation is solved . Finally, comparing the running performance parameters before and after the model optimization, it proves that the strategy is very necessary to increase the speed of driving complex model ,enhance the performance effect of simulation and save the resource cost of computer.