采用光滑粒子流体动力学（smoothed particle hydrodynamics, SPH）方法结合MoorDyn数值模型，对阶梯海床上系泊浮体动力学行为进行系统性地数值探究。在与实验数据进行对比验证的基础上，具体探讨了波高与阶梯高度对阶梯海床上系泊箱式浮体运动响应以及系泊力的影响规律。研究表明，阶梯上下两浮体的运动响应均随波高增大呈现增大趋势；缆绳系泊力除L3的结果曲线规律性不显著外，其余三条缆绳也呈现增大趋势；随着阶梯高度的不断升高，海床阶梯上下两浮体则出现了差异性的变化规律。此外还发现，在不同计算工况下缆绳L2系泊力与L0、L1均约为3倍关系，缆绳L2系泊力与L3均约为2倍关系。

SPH (smooth particle hydrodynamics) and MoorDyn numerical model were used to investigate systematically the dynamic behavior of moored floating bodies on stepped seabed. Based on the comparison with the experimental data, the influence of wave height and step height on the motion response and mooring force of moored box floating body on stepped seabed was discussed in detail. The results show that the motion response of the two floating bodies increases with the increase of wave height. The mooring power of the other three cables also show an increasing trend except for L3. As the height of the ladder continues to rise, the two floating bodies above and below the seabed ladder appear different change rules. In addition, it is found that the relationship between L2 mooring and L0 and L1 is about 3 times, and the relationship between L2 mooring and L3 is about 2 times.