In order to solve the problem of severe vibration caused by fruit tea garden conveyer in practical use, a semi-active suspension system using CDC damper was designed, and the loading test was carried out by using fuzzy PID control method. According to the suspension system dynamics model, MATLAB was used to establish a Simulink model of fuzzy PID controller, which was analyzed and the parameters were adjusted, and the ideal simulation response results were obtained. Through the analysis, the performance of semi-active suspension system was improved by 10% ~ 20% compared with that of passive suspension system. Design of hardware part of the semi-active suspension system and loading test, the system of mechanical parts including the elastic element structure, shock absorber, steering mechanism, and the parts fitting the transformation, consider front axle layout space arrangement, the shock absorber system layout in the form of oblique arranged with the horizontal plane Angle of 30 °, elastic element for vertical layout, steering mechanism installed in the middle of the front axle position, to limit the movement before and after the front axle and constraint the trajectories of vertical direction. According to the design of fuzzy PID controller for the design of control circuit system, the semi-active suspension loading experiment was carried out, using vibration meter and vibration sensor system is built, the test vehicle in the process of driving seat position z axis vibration signal, respectively in speed and load conditions, through the semi-active suspension before and after loading, the results of test of conveyor with semi-active suspension vibration drop of about 50%, reached the design requirements of the semi-active suspension system.The vibration frequency concentration range of the vehicle body with semi-active suspension system is more than 8Hz, indicating that the driving comfort of the vehicle is better.