By combining correlation analysis method and threshold de-noising method, a methord based on ant colony
algorithm is given for optimizing wavelet de-noising double-threshold. The reasonable optimization interval is determined
according to the charactersitic of distributed of noise. The objective function is chosen according to the difference of
autocorrelation coefficient of signal’s wavelet coefficient and noise’s wavelet cofficient. Finally the optimal upper threshold
and lower threshold are calculated by using ant colony algorithm. Simulation and compressor vibration fault detection
application results show that the proposed method can optimize the de-noising threshold and denoise effectively.