This paper takes the waiting anchorage of the Babao ship lock on the second channel of Beijing-Hangzhou Grand Canal as the research object.Based on previous achievements such as traffic volume prediction，analysis of navigation conditions and operational characteristics of Babao ship lock，this paper uses empirical formula and queuing model to analyze and calculate the appropriate anchorage capacity，makes an example comparison using the layout of the waiting anchorage of Sanbao ship lock，and proposes targeted transformation measures.The results show that the appropriate capacity of the waiting anchorage is no less than the number of ships in three lock times.It is recommended to set up a remote dispatch anchorage for cascade dispatch.