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The working state and environmental data of the aircraft can be obtained by telemetry signal, which provides a basis for performance evaluation and fault analysis. In this paper, takes the advantage of wavelet packet transforming can decompose the high frequency signal, in terms of the problem when the threshold function of the traditional wavelet packet de-noising method is used to deal with both mutation and smooth signal, it is impossible to maintain good signal edge characteristics and eliminating constant deviation while avoiding the oscillation that the signal does not have, An improved wavelet packet de-noising of telemetry signal based on dynamic threshold function method is proposed. By quantized the smoothness of the current signal and the wavelet packet dynamic threshold function which is between hard threshold function and soft threshold function and can be switched, follow the signal changes to carry out de-noising. Simulation results show that the proposed method has better de-noising effect than the traditional wavelet packet method for the both mutation and smooth signal.