The construction of a new ship lock project on the existing hub in the sharp bend river section has many restricted factors in the layout of the ship lock and complex navigation conditions.In order to analyze navigation flow conditions of the ship lock approach channel,we establish a 180 normal physical model of the Yuanhe Shizhou hub,and conduct tests on navigation flow conditions of the upstream approach channel of the ship lock.Then we compare the flow velocity distribution in the entrance area of different lengths of the separation dike,and analyze navigation conditions of the entrance area of the ship lock in combination with self-propelled ship model tests.The results indicate that extending the separation dike has a significant effect on reducing the peak lateral flow velocity in the entrance area and improving the flow pattern.When the separation dike is extended by 250 meters,the maximum navigable flow of the upstream approach channel of Shizhou ship lock can reach the standard requirement of a once-in-20-year flood.