Abstract: It is important to determine the key influencing factors, which restrict the development of agricultural mechanization. A method of DEMATEL was applied to set up direct effect matrix in order to seek integrated effect matrix from the view of interactional relationship among influencing factors of agricultural mechanization development. All influencing factors were researched and the key influencing factors of them were determined and analyzed by the number through calculating degree of influence, degree of being-influenced and degree of center for every factor. Finally, the suggestions were put forward in order to accelerate development of agricultural mechanization.