Abstract: Through the research of seismic geological conditions and original seismic data analysis of south steep slope belt in Biyang depression, the problems occurred during 3D seismic data interpretation such as inconsistency of frequency and phase, poor closure among different blocks and boundary effect have been found out. Based on the frequency, phase, moveout, and SNR, the unique characteristics and differences of seismic data, the consistency method of pre-stack energy, phase and amplitude has been adopted to carry out the compensation and correction, eliminating the variation and ensuring the consistency of seismic data. The pre-stack time migration technique has been adopted at the same time to make possible the correct return of boundary faults. The merging processing effect of 3D seismic data pre-stack time migration demonstrates a reasonable whole pattern, a clear boundary effect and regional structure and big probability of section interpretation.