It is necessary to study the navigable condition and navigational clearance dimension of the bridge,because the piers may have a great impact on the navigation safety.At present,the research on the navigable demonstration of the bridge mainly includes the water flow velocity,flow direction,navigational clearance height and width,while little research has been done on the ship motion state which representative ship through the navigable hole.Based on the 2D flow mathematical model,this paper establishes the mathematical model of ship maneuvering motion,and simulates and calculates the ship attitude and navigation parameters,including heading angle,rudder angle,drift angle and speed.The results show that it can better simulate the control and navigation conditions of the ship under different hydrographic conditions and different navigational holes.