The paper developed an automatic height control system for stripper based on a MCS AT89C52. The hydraulic lifting device of a stripper harvester 4LS150 was analyzed, and the relationship between the stripper and crop height was determined. An automatic measuring unit of crop and stripper height was designed. According to the auto control theory of working process of a stripper, the modern micro electronic technology and MCS control technique was used, and a single chip classical control system was designed to control working process of the stripper in this paper. This auto control system can m...