An improved self-adaptive de-noising method based on discrete stationary wavelet transform is put forward.The method is used for pressure signal de-noising and get better effect than the traditional discrete binary wavelet de-noising.In this method

the discrete stationary wavelet transform is used to solve the oscillation effects of singular points in signal de-noising by the discrete binary wavelet transform

and the detail coefficients noise and different noise intensity in different level are taken into consideration.The detail and approximation coefficients in each decomposition level are self-adaptive denoised using the thresholds

which are estimated by the noise intensity accordingly.The pressure signal de-noisong experiment is carried out compared with the traditional discrete binary wavelet transform

the feasibility and validity of the mehtod are proved.