In view of the contradiction of the increasing throughput，limited tidal navigable window period，high demand for navigation，and complex navigation environment in a foreign estuarine port area，we carry out the waterway throughput capacity analysis by the simulation test method. Based on the bottom elevation of the built waterway and the distribution of high tide water level，the tidal window period of different ship types in different directions is deduced；Based on the software SIMIO，a simulation model including terminal，internal anchorage，waterway，transfer barge，offshore transshipping platform，and floating crane is established with consideration of the influence of tide and tidal current on ship navigation. Through the test，it is verified that the“port-transfer barge-transshipment facility” system including the waterway can achieve the target throughput. The analysis results provide an important basis for the short-term production scheduling and long-term expansion planning of the port area，and also may serve as reference for similar projects.