The flight simulator is the main equipment for flight training,the flight simulation fidelity is a key factor affecting the quality of training,and the fidelity of flight simulation depends on the washout algorithm used.Now the most commonly used is the classical washout algorithm,but there are some shortcomings.Aiming at the problem of existence of the classical washout algorithm acceleration signal loss and phase error,combined with fuzzy control,the classical washout algorithm was optimized to achieve realtime dynamic adjustment of the washing algorithm,and signal compensation of high acceleration channel.Finally,the two algorithms were simulated and analyzed by Simulink modeling to verify the superiority of the optimized washout algorithm.The verification results show that the optimized washout algorithm effectively solves the problem of the loss of speed signals and the phase error implied,and improves the simulation fidelity of the flight simulator.