In order to master the influence law of ship rolling motion on the parameters of missile vertical ejection barrel under high sea states，a dynamic vertical launching model based on launcher，launch canister and missile coupling system is built.The flexible deformation of launcher and launch canister，as well as the movement transfer relationship among launcher，launch tube and missile are considered in the model.The correctness of the model is verified by comparing the dynamic simulation data and actual test data of vertical ejection process of a ship-borne missile.The changes in vertical ejection parameters of missiles caused by the changes in ship rolling motion parameters under high sea states are simulated and analyzed based on this model.The analysis results show that the pitch angle and pitch angular velocity of missile exhibit a linear increasing trend with the increases in ship roll angle and angular velocity amplitude.The effects of ship roll angle and angular velocity on the roll angular velocity of missile exhibits randomness，The roll angular velocity of the missile as it exits the tube changes drastically when ship roll angle is -14°or ship angular velocity is 11.2°/s.