Abstract
Recently the development of agriculture vehicles such as a tractor has brought new demands on cabin environment. Especially the improvement of ride comfort has become increasingly important. As the measures of vibration reduction, only rubber bushes are just installed in conventional tractors. Therefore the vibration from road is directly transmitted to the driver in the cabin, consequently the driver is continuously persecuted by this vibration. This paper presents the method of the vibration reduction of the using semi-active suspension system for cabin mount and horizontal direction to provide the comfortable working environment for the driver.