Aiming at the engineering problems that there is large-scale back-flow whirlpool at the entrance of the upstream area in the hub ship lock on the curved reach and the oblique flow in the approach channel，we adopt the method of the whole normal hydraulic physical model tests，and research the influence of different dispatching mode of the discharge sluice on the navigation flow conditions of the upstream approach channel and entrance area of the convex-bank ship lock. The results show that the lock in the convex bank hub，discharge sluice opening the remote area at the entrance of the gateway of scheduling can effectively weaken the reflow scale and the intensity of the approach channel oblique flow to ensure navigation safety.