The artillery system is simplified to an axially moving cantilever beam under the action of a moving mass. The axially moving beam’s vibration control equation that considering beam’s tension was obtained based on the Bernoulli-Euler theory and Hamilton principle. Using assumed mode method and Galerkin Discrete method to solve this vibration control equation. The difference between considering and unconsidering axial movement in artillery model was be analyzed by by numerical simulation. And considering the influence of initial disturbance on transverse displacement of the beam’s top.