Abstract: This project is based on a self-propelled field machine which is used to cut leaves ＆ branches originally and has a high ground clearance. The traveling device will be modified to a hydraulic-driven type. In addition, this machine will be equipped with a spraying system. After improvements this machine will be tested in fields of high-stem crops. A hydraulic-actuated traveling device can make the body of a vehicle more stable when this machine moves on crops during field operation. Instead of traditional spraying work by hand, mechanical spraying can reduce the load of farmers significantly. Not only the spraying operators can be prevented from pesticide`s harm, but also the purpose of plant protection can be achieved effectively.