High voltage submarine cable laying is the key link of offshore wind farm development. In order to improve the simulation accuracy of submarine cable laying and landing, the paper uses the hydrodynamic analysis method to apply viscous damping in SESAM/HydroD to obtain the Response Amplitude Operator (RAO) of cable laying vessel. The coupling model of cable-laying vessel-submarine cable-mooring system is established in Orcaflex to analyze the effect of viscous damping on the response of the coupling system. Through the comparative evaluation of the position, tension and curvature of the submarine cable, the maximum allowable operating sea state of the submarine cable landing is given. The results show that the heave amplitude of the hull decreases by about 55% after considering viscous damping. The effective tension and curvature during laying and the offset during landing of the submarine cable are significantly reduced. Taking the analysis results of vessel viscous damping into account as engineering guidance can effectively reduce the expropriation area of submarine cable landing in the sea area, and increase the operation window period with improvement of the efficiency of submarine cable laying.