Abstarct: Breakwaters are structures that protect ports and beaches from waves and coastal currents. The use of breakwater as an integral component in ports is essential to counteract the forces coming from the waves and to provide a safe environment for loading and unloading ships. Rubble mound Breakwater is the most commonly used breakwater for economic reasons. Nowadays, in the oil refinery ports, a pipeline can have some intersections with the protective breakwater, which will lead to some uncertainties about the seismic interaction of this complex and an example of this situation can be seen in the design of pipelines for the Pars petrochemical port. In this port, the pipeline crosses the crest of the rubble mound breakwater to carry oil products to the loading wharf. In this study, we used Abaqus software to model the South Pars breakwater. Initially, the amount of breakwater subsidence under static and dynamic (earthquake) loads was investigated, Then, considering the sensitivity of the pipeline to the subsidence at the time of the earthquake, the pipeline support subsidence was investigated by pounding the pile at the breakwater. To investigate the effect of different parameters of pile geometry such as pile length and cross-section, models with different lengths and cross-sections were also investigated. Investigations showed that the interaction of the breakwater and pile causes some complexity in the seismic behavior of the breakwater and the use of pile - breakwater system will improve the seismic behavior of the South Pars breakwater.