Ocean multi-scale dynamic processes are the focus of current oceanography research. Seismic oceanography can obtain high-quality data with a resolution of 10 m on hundreds of km section, so it can analyze the sub-mesoscale dynamic phenomenon at the edge of an eddy （such as the beautiful spiral arm found in the Arctic Ocean seismic section study） and the vertical amplitude structure of the internal solitary waves, and can combine the internal solitary wave waveform change with the mixing parameter distribution. This paper reviews the new insights and advances of these studies. At the same time, the common offset section prestack migration method makes full use of the multiple coverage characteristics of multi-channel seismic method to obtain the temporal variation of seismic images, thus adding a key tool for seismic oceanography to reveal the spatio-temporal evolution of the ocean internal structure. Therefore, the new space-time perspective provided by seismic oceanography will play an important role in the study of ocean multi-scale dynamic processes.