Abstract :� � In military application, rocket launching platform of multiple launcher rocket system (MLRS) is�extremely required high stability and precision movement mechanisms. Correctly, moving to assigned�firing angle, obtained from fire control system, will result in good target hitting. However, platform�vibration caused from continuous rockets firing will dramatically reduce the shooting accuracy, especially�in case of unguided rocket. This paper presents a 3 degrees of freedom dynamic system simulation of�unguided MLRS for launching platform stability study at various firing angles, using MATLAB. The�simulation results reveal that the firing angle directly affects the platform vibration characteristic. For all�examined firing angles, the launching system will reach the steady state after 2 seconds of firing. The�outcomes from this research will be lately used to improve the rocket fire control system under vibration�situation.