###### Abstract
The effect of other wave parameters, such as wave period and water depth, has also been comprehensively studied [22; 23; 24]. The influence of different structure styles on the stability of breakwaters was studied by many scholars through laboratory wave flumes. [PERSON] et al. [25] found that the stability of breakwater would be significantly enhanced after the OBREC (Overtropping Breakwater for Energy Conversion) was installed. [PERSON] et al. [26] proved that the wing plate could restrict the movement of the floating breakwater, and the porous media on both sides of the wing plate could effectively reduce the reflection and transmission of ocean waves. The effect of acropcode arrangement [27], seabed slope [28], parapet geometry [29], and toe berm geometry [30] on the stability of breakwater was also illustrated in detail by physical model test results. In addition, a systematic approach and relevant formulas were also proposed to evaluate the stability of breakwaters [31; 32; 33; 34]. The above works have studied many factors affecting the stability of breakwater and successfully revealed the interaction between waves and breakwaters from the perspective of fluid dynamics. However, the plastic deformation and liquefaction of seabed foundation were not considered in them. Currently, it has been widely recognized that there are three types of failure mode for the wave-induced failure of offshore breakwater. They are, respectively: (1) excessive residual horizontal displacement of breakwater due to slipping, referred to as model I; (2) breakwater is overturned due to huge wave impact, referred to as model II; (3) the foundation of breakwater partially or completely lost bearing capacity due to softening or liquefaction [35; 36; 37], referred to as model III. Due to the fact that the seabed foundation of breakwater was not, or could not be, taken into consideration in numerical computation or physical model test, the safety of breakwater can be only checked for the failure mode I and failure mode II in most previous works or some currently implemented national design codes, e.g., the Chinese code of design and construction of breakwater [38] or the Ocean Engineering Handbook [39]. Actually, the wave, breakwater and its foundation are a coupled system in the ocean environment. The foundation of breakwater plays an important role in guaranteeing the stability of breakwater. Engineering case survey for breakwater failure shows that about 60-70% of failure cases have a closed relationship with the softening and liquefaction of foundation soil due to the pore pressure accumulation under cyclic wave loading. Therefore, the evaluation for the safety of breakwater is not reliable if the foundation of breakwater is not taken into consideration, regardless of adopting numerical modeling or physical model test. In this study, taking the reclamation engineering in the South China Sea as the engineering background, a series of large-scale physical model tests are carried out to study the dynamics and the stability of the revetment breakwater built on the reclaimed coral sand foundation under extreme regular wave impacting. The physical model is established in a wave flume by a geometrical scale of 1:10. It is found that the revetment breakwater does have a certain settlement under the impacting of extreme wave loading and finally reaches a stable state. In addition, it is worth noting that the ability of the revetment breakwater against overtopping is relatively weak. The testing results can be a solid basis for the further works and provide some valuable references for the design as well as the past-construction maintenance of the revetment breakwaters built on the reclaimed coral reef islands in the South China Sea.