In the process of wave-structure interaction，if the incident wave direction and the structure are less than a certain angle，Stem waves propagating along the building will be generated.Its wave energy is rapidly concentrated during propagation，which has an important impact on the stability of the dike structure and the wave conditions in the harbor.In this paper，the variation law of Stem wave height distribution with wave incident angle under regular wave and irregular wave and the wave height distribution of Stem wave in front of different structural breakwaters are compared and analyzed through three-dimensional wave physical model experiments.The results show that the Stem wave height perpendicular to the axis of the vertical embankment is partial standing wave distribution under the action of regular wave and irregular wave，but the amplitude of the change of the Stem wave height perpendicular to the axis of the breakwater under the action of regular wave is significantly greater than that under the action of irregular wave.For non-perforated vertical embankments，under the same incident wave period，when the wave steepness is large，the comparative height of Stem wave is small.In the case of the different incident wave period，when the wave incidence angle is small for a non-perforated vertical embankment，the wave steepness has little effect on the comparative height of Stem wave.In the case of larger incident angles，when the wave steepness is large，the comparative height of Stem wave is small.The impact of wave incidence angle and whether the vertical embankment is perforated or not on the comparative height of the Stem wave in front of the vertical embankment is significant，and the law is obvious.