Compared with traditional breakwaters，floating breakwaters have been widely developed because of their advantages such as convenient installation，water quality exchange，construction in various environments and mobility.Smooth particle hydrodynamics (SPH) method is used to study the interaction between regular wave and floating breakwaters.Firstly，the convergence of particle spacing is analyzed based on a regular wave propagation example in an empty water tank.Then，the interaction between regular waves and single and double floating bodies is simulated based on the verified water tank model，and the waveforms in front and back of floating bodies，the movement of floating bodies and the velocity field near floating bodies are analyzed.The results show that the double floating breakwater can significantly improve the wave absorbing performance compared with the single floating breakwater.