In order to solve the problem that the warship platform affects the calculation accuracy of the naval gun elements, the heave and deformation of the ship are studied. According to the principle of ballistic rigidity and the characteristics of ship deformation, a calculation model of the various elements of the ship’s heave and deformation is established. The simulation method is used to analyze the change trend of various errors caused by heave and deformation, and the conditions for the correction of the shooting elements are proposed. The simulation results show that the calculation errors of the various elements increase with the increase of the ship’s heave and deformation angle, and with the decrease of the shooting distance, the direction aiming angle increases with the increase of the shooting distance, and the high and low aiming angles has nothing to do with shooting distance. The research has certain theoretical and practical value.