Due to the bad weather, large flow in flood season, and maintenance of lock, a large number of ships wait lockage at the Three Gorges dam, and the berth of anchorage faces a serious shortage. This paper establishes queuing models of anchorage by the queuing theory to evaluate the scale of anchorage on the basis of statistics, which provides a reasonable basis for the study on the construction scale of the anchorage of the Three Gorges.