According to a practical cases of the deep channel in Guangzhou port,this paper analyzed the process of ships arriving anchorage,entering channel,operation on berth and leaving port,and built a complex channel system simulation model which considered the influence factors such as tidal,multiple branching channel control rules.Based on the port service level in condition of traffic volume forecasting and the development of ship type,the paper analyzed the throughput capacity of several broaden project schemes of deep channel in Guangzhou port which offered important support to the broaden project.