Arc-shaped crest wall can effectively decrease overtopping across slopping breakwater and help reduce elevation of crest wall. So it is more and more used in coastal engineering. But there is not any provision on how to calculate wave pressure on arc-shaped crest wall in current standards. Based on a physical experiment on an actual project, this paper presents measured pressure results along the arc-line of the crest wall, which is further compared with the calculated results following the standard provisions on vertical crest-wall. Finally, pressure distribution on the crest wall is summarized. These results can be used as reference to other similar projects.