Abstract: Suspension cable from the deck to the top of the leg on the wind turbine installation vessel is affected by the height of leg and wind in the working process.As a result, the tension at the top of the leg changes at all times.The wind load coefficient of suspended cable was calculated by analytical method and finite element method, and the errors of the two methods and the accuracy of finite element method were compared and verified.Then the hydrodynamics finite element method was used to calculate the tension of the suspension cable.Finally, the effective tension of the suspended cable under different wind speeds and heights was calculated to obtain the ultimate tension of the cable, and the load-bearing tooling at the top of the pile leg was designed according to the ultimate tension.