A new type of electronic control hydraulic hitch system is designed for the small and medium sized tractor which has a problem with low accuracy of position deepness control system in this paper.Firstly,the simulation model of electronic control hydraulic hitch system of the tractor is built based on AMESim.Secondly,the 1 L-225 plough hitch model was built by Adams,and the features were analyzed,getting variation curve of plowing depth with displacement of the hydraulic cylinder,and variation curve of ploug...