Abstract: Bridge piers are subject to various wave effects in marine environment. Studying the wave forces on deep-ocean bridge piers is crucial for the safe construction, effective use and maintenance. A numerical wave tank was established based on the open source platform DualSPHysics, utilizing the high efficiency of Smoothed Particle Hydrodynamics (SPH) in fluid simulation. Numerical wave generation and wave height monitoring were conducted to verify the feasibility and accuracy of the SPH method in wave generation and results. Experiment control conditions were established to analyze the variation of wave forces on structures with different cross-sections under various wave heights and periods. The simulation efficiency of the SPH method was compared with grid-based computational fluid dynamics methods, and the influence of inter-particle distance and computer hardware on SPH simulation efficiency was analyzed. Experiments demonstrate that the SPH method accurately simulates fluid motion, the simulated wave forces match experimental data well with a relative error of 5%, and the simulation efficiency is significantly higher than that of the grid-based methods. Inter-particle distance significantly affects the computational efficiency and accuracy, and the number of CUDA cores in the GPU significantly influences the computational accuracy and efficiency of the SPH method.