Based on the integrated physical model test,we study the navigation condition at the entrance areas of the shiplock approach channel and the connecting section of Yakou hydro-junction in Hanjiang river. The navigation condition of shiplock and influential factors under the engineering arrangement in design scheme are expounded. In view of the disadvantages of navigable flow condition which exist in the design scheme,we propose the optimized measures such as the layout of circular-arc separation levee on the lateral side of connecting section at the upstream of the shiplock and the local dredging in the channel bed.Experiments show that it is a good method to solve the navigation problem of shiplock in the hydro-junction.