Diver’s ladder is a platform mounted with the mother ship by a pin for divers to embark and disembark the ship. In order to ensure the safety during the diving operation in waves, the de-sign requirement is rather high for the hydrodynamic force, motion response of the ladder and the dy-namic force of the pin. In this problem, the hydrodynamic characteristics of the diver ’s ladder are different from those of a free floating structure in waves. By taking the mother ship and ladder as a whole system, boundary element method based on the deep water Green function is adopted to inves-tigate the motion responses of the system in regular waves with the numerical integration of the ra-diation and diffraction pressures on the average wet surface. The ladder ’s wave loads, inclusive of Froude-Krylov force, diffraction force and radiation force, are then calculated through the pressure integration on its wet surface. Further, motion responses of the ladder are numerically evaluated by using the rigid motion theory according to its relative position with respect to the mother ship. With the input of ladder’s motion responses, wave loads and the dynamic forces exerted by the pin, a dy-namic equilibrium equation is constructed for the diver’s ladder. Based on the ideas above, the in-fluences of typical parameters, such as the wavelength, forward speed and ladder’s relative position, are illustrated systematically to achieve the change rule of the hydrodynamic characteristics for the diver’s ladder. If such hydrodynamic rule is made clear, it is expected to effectively guide the lad-der arrangement, pin selection and ship maneuverability at the diving operation.%潜水员梯是通过销轴连接在母船舷侧为潜水员执行潜水作业时上下船的平台，为保证在波浪中使用时的安全性，对其波浪作用力、运动响应及销轴处的动作用载荷设计有较高要求。为研究母船干扰下潜水员梯的动态响应特性，采用基于深水格林函数为积分内核的边界元方法，先计算母船及潜水梯这一整体的运动响应及其平均湿表面的辐射和绕射压力分布，依据刚体运动合成原理求解得到潜水梯重心处的运动。再以潜水员梯为研究对象，采用压力积分方法获得潜水员梯的波浪力作用，并将其运动、波浪力和销轴处的作用力联立构成动力学平衡方程，逆向求解出销轴处的动作用力。基于上述思路，系统研究了波长、航速及潜水员梯与母船相对位置变化时潜水员梯的运动、波浪作用力及销轴处作用力的变化规律，为潜水员梯的布置、销轴的选型及潜水作业时母船的操纵可提供指导意义。
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