The propagating ultrasound is disturbed by the clutter, which is resulted from interior discontinuities, material impurities, etc.. And the clutter may submerge the detected flaw reflection.Therefore, ultrasonic echo needs to be enhanced.Wiener filter is the common method of acoustic enhancement, and here is utilized in the ultrasonic noise reduction.We give the procedure of the Wiener filter to process the ultrasound.Firstly, initial noise power spectra of no pulse phases are statistically averaged.Then the power spectra of the ultrasound phase with clutter are adaptively calculated. Finally, the Wiener filter is performed to each ultrasonic phase. The experiments of the ultrasonic data filtering under different signal-noise-ratios are demonstrated that the proposed method is valid.Wiener filter has the same ability with spectral subtraction to reduce the noise superposed on the ultrasonic echo, and is more effective.