Abstract:In this paper, application of the side-scan sonar system in Rongcheng ocean current energy power demonstration station project has been introduced. The working principle, characteristics of atlas, and factors which will affect the image quality are analyzed. Based on scanned images, datas processing and feature extraction have been done. The geomorphologic classification results are applied in designing and construction of this project, and gained a good result. Problems which will happen in the project are summarized as well.