Simulation models are established for the 100 000 DWT branch and the planning 200 000 DWT branch of Qinhuangdao port by SIMIO simulation software.The model is firstly verified by the data of berth number,waterway facilities and statistics of calling ships of Qinhuangdao port in 2014.Good correspondance between the modeled results and the statistics is obtained in terms of numbers of annual calling ships and the cargo throughput.By changing the average arrival interval of vessels,the variation tendency of the cargo throughput,the average waiting time(AWT)and the service level are investigated based on the simulation results.The variation tendency of the utilization of channel and the berths with the service level is discussed.Comparison is conducted between the results of cargo throughput of the 100 000 DWT branch by simulation model and prediction formula.The necessity is pointed out in terms of taking into account the service level of port and the correlativity among various operations inside a port.