By setting a certain type of weapon launch tower pendulum system as the research object,using software based interface co-simulation strategy,the dynamics co-simulation program were developed.A mechanical-hydraulic coupling simulation model of the tower pendulum system was established by using the simulation software of MSC.ADAMS and Easy5.By the simulation,the movement and force of the system were gotten and compared with the experimental data.The effectiveness and practicality of the established model by coupling method are verified,and the way to solve the tower pendulum system's speed fluctuation problem is proposed.