Aimed at the problem of typhoon resistance of large non-self-propelled cutter suction dredgers,the hydrodynamic model of cutter suction dredger is established.The quasi-static analysis method and time-domain dynamic analysis method are used to calculate the maximum wave force tension and the maximum tension of mooring line under different operating conditions respectively.Comparing the results of the two methods,the mooring capacity of the cutter suction dredger is evaluated scientifically.The results show that both the quasi-static analysis method and the time-domain dynamic analysis method can be well used in the calculation of mooring capacity.The mooring equipment can meet the needs of mooring positioning and ensure the security under the 15th typhoon.