Seismic sedimentology is the use of seismic data in the study of sedimentary rocks and the processes by which they were formed. The key technology includes: ninety-degree phasing of seismic data and stratal slicing etc. The technology of ninety-degree phasing of seismic data gives lithological meaning to seismic phase and can be used in high frequency sequence interpretation; the technology of stratal slicing can be used to study the planar distribution of isochronal depositional systems by using a kind of slice named "stratal slice”.To make the stratal slice,a series of surfaces are firstly inserted between two isochronal depositional surfaces and then slices are made along each of them. Ideas in this paper is that: (1) At present , seismic sedimentology is only used in the research of macroscopic formation, rock, depositional history and depositional systerm because of the limit of seismic resolution.It still can not reach the research of sedimemtory rocks and the process in which they were formed. Therefore, seismic sedimentology at present is a subject to study macroscopic formation, rocks, depositional history and depositional systerm with seismic and well logging data using the geophysical technologies. It still needs a further development to be a new subject like seismic stratigraphy and sequence stratigraphy which are used to study the sedimentary rocks and sedimentary process. (2) In the use of the phasing technology, the phase-adjust angle should't be limited to 90 degrees and it should be determined in the well log-seismic data calibration. (3) Strata slice is more perfect than time slice and horizontal slice, but at present, the alteration of deposition rate versus time is ignored in the strata slice technology. Therefore, strata slice is not strictiy along the isochronal surfaces. 