Abstract: The research on channel sand architecture anciently emphasized particularly on the reservoir pattern and size etc.As to the study on abandoned channel and lateral accretionlayer is mainly depended on qualitative analysis. With the gradual application of the seismic techniques about the frequency interpretation and channel edge detection, the precision of the channel sand body architecture is further raised.On one hand, the distribution of the sand body and the channel belt can be confirmed, and the boundary of the terminal channel can be sketched; on the other hand, the location of contact interface between the sand bodies can also be reflected, which can reveal the continuous distribution character ofthe entire geological event. Taking Gangdong development area as an example, this article introduces the program, thetechnical ideas and the application result of the research on complex channel sand body with the frequency interpretation and the channel edge detection techniques are presented.With gradual indepth research on the work, the favorable basis will be provided for the quantification of the reservoir potential and the optimization of the horizontal well's track,and the consummation of the reasonable flooding network in the maturing oilfield.