Abstract：The processing of joining new-acquired 3-D seismic data with legacy data has merging problem because of different shooting and receiving parameters. The merging of 3-D seismic data can be looked as the issue of optimum in different scale space mathematically,the key is how to realize the time-variant merging. Using Mallat factor in wavelet analysis and carrying out the mufti-resolution decomposition for two stack data at merging position;using least-square algorithm to compute optimum match filter in different scale space and applying each match filter to one of 3-D prestack data after mufti-resolution decomposition separately, the merging goal is arched. The method can realize time-variant merging automatically，result in simultaneous corrections both for phase and amplitude and avoid the influence of noise. The real applacation showed that the data merging method by wavelet transform has good effects.
