Abstract: Single-channel seismic exploration has become one of important means to reveal shallow geologic structure in marine geological investigations with its advantages of easy operation, high-efficient and low-cost. Based on previous research results and for the protection of the integrity of signal, the band-pass filter to filter out the random noise in the low-frequency signal and the wavelet threshold de-noising method to filter the random noise in the high-frequency signal is used. In the experiments, the sym5 wavelet is used to decompose the seismic profile by three layers of wavelet decomposition with soft and hard threshold de-noising. The results show that two threshold de-noising methods further enhance the quality of the section on the basis of the band-pass filter, which makes the reflection event become continuous tracking. The soft threshold de-noising method filters out more information on the profile, and the de-noising method effect is more thorough. And the hard threshold de-noising method retains more details.