Abstract: The Monte Carlo simulation system constructed with random and uncertain factors taken into account.Specific experiment steps are discussed.The flight kinematics equations with six degrees of freedom are set up under the condition of aircraft icing,and the dynamic response of pilot-aircraft-environment system after icing is also studied.The flight parameters that can re-flect aircraft motion states intuitively after icing are analyzed,and the flight risk judgements are given under the condition that the relative velocity and angle of attack exceed the limits.The dis-tribution characteristics of one dimensional extreme flight parameters are calculated.The results show that the kurtosis of the two kinds of extreme samples are both larger than 3 ,that means the two kinds of extreme samples have longer tails than the normal distribution.The fact that both the extreme relative velocity and the extreme angle of attack have heavy tail distribution charac-teristics is verified.