Aim To study the influences of various types of manufacturing imperfections of a rocket upon the initial disturbance. Methods According to the construction of the weapon system

a model for launching dynamics is established. Monte Carlo method is applied to numerical simulation of rocket launching. Results The influences of rocket static unbalance

dynamic unequilibrium

and propulsion eccentricity was obtained. Conclusion The effects of rocket manufacturing imperfection to the initial disturbance can not be ignored

which must be considered in rocket weapon development.