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Abstract. Considering the rough unevenness of road surface and nonlinear stiffness and damping of tire, it generates tough challenges of vibration control for developing tractor ride comfort and driving stability. This paper deals with the vibration control of a front axle suspension system to be fitted on a high-power wheeled farm tractor. In this study, a dynamic multi-dimensional model was constructed for a wheeled tractor that considers its vertical, bounce, pitch, and roll motions in order to clarify the tractor‘s vibration characteristics. A semi-active suspension control strategy was proposed to control the vibration acceleration. Random road surface classes were then generated to simulate the surfaces of actual farm roads, which are irregular and complex. The results of simulations revealed that the proposed control strategy is more accurate and effective within a certain range by changing suspension force. Furthermore, the results of the investigation of the effectiveness of semi-active control under different circumstance revealed that active control is very effective when the front axle suspension on limited conditions. In addition, drive speed at 15Km/h under transportation operation was the initial input when the active control is engaged. The approach developed in this study provides a reference for manufacturers and a method for solving the problem of tractor comfort.