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Genetic algorithms are not limited by the nature of the problems(such as continuity, differentiability), can handle complex problems that traditional optimization algorithms can’t solve.It has been widely applied in control parameters optimization in recent years.But there is not a common standard to choose its crossover probability and mutation probability,by means of the comparison between different groups of optimization results by different crossover probability and mutation probability to determine the appropriate crossover probability and mutation probability, and select the most suitable one from several control systems commonly used performance indicators as the fitness function,get the control parameters when there’s no fault on the aircraft. When the system open-loop transfer function remains unchanged, the system closed-loop transfer function poles does not change, by the elevator damage degree and control parameters when there's no damage control parameters after reconstructed can be obtained. The simulation result shows that the system using the method based on is genetic algorithms of no vershoot. As well, the settletime are shorter. The better control effect than the traditional design methods.after reconstruction, the system performance can be maintained constant, the method achieves a good effect on the reconstruction 