The cross-flow of channel in the entrance of the encircle breakwater which stretch out the coast is always concerned, for it may influence the ship to navigate. For the different design plan of the encircle breakwater entrance in Xuwei port, the cross-flow of every design plan is simulated by the 2D tidal-current numerical model. The results shows that the maximum cross-flow of flood tide is greater than that of the ebb tide, which means that the maximum cross-flow is dominated by flood tide; The maximum cross-flow of every plan occurres in the waters near the entrance(or the dike head) around high tide level period. The maximum cross-flow is related to the width and the layout of the entrance. After the double-dike is built, the location of the maximum cross-flow moves outward the waters near the dike head. The maximum cross-flow gradually decreases towards the entrance, which is good for ships near the entrance to navigate.