The track width is an important parameter for channel planning and design，and it has always been difficulty in calculating the channel width. In view of the difficulty in obtaining the value of the calculation coefficient of the track width in the current standard，based on the ship simulator，this paper proposed a method of directly calculating the track width by using the simulation data，which divided the track width into the route offset and the space occupied by the ship itself. In combination with the channel in Taizhou Bay Bridge area，the track width under typical wind and flow conditions is simulated and compared the conclusion with the current specifications. The results of the two methods are basically consistent. It shows that this method is feasible and has good practical value.