On the basis of the integrated physical model test and telecontrol self-propulsion ship model test of the Xiaoxitan junction, according to the hydraucone type and slight bending river of the position of this dam site, we put forward a non-orthogonal layout of ship-lock on the upside of the dam axis, which solves the problem of the difficulty of connection between the approach channel and river mainstream, and propose a new arrangement for the ship lock arranged difficulties on the bending river and construction in progress to build an additional ship lock.