The zero-offset (z₀) section is an important achievement in seismic reflection imaging. The differences between the common midpoint (CMP) and the common reflection point (CRP) are discussed on the basis of the dome-like reflector model. In usual seismic data processing, we cannot get the correct z₀ sections if oblique layers are imaged. However, the prestack time migration technique using CRP stacking can help us to obtain the correct z₀ sections. This paper discusses the key steps in the application of such prestack time migration techniques as seismic data preprocessing, construction of migration-velocity field and CRP gather processing after migration. The processing effects are demonstrated with real data.