Abstract: The mechanization of agriculture is an important section of the modern agriculture.In this article the paper put forward the constrained aspects of agricultural mechanization development.Such as the total power of farm machinery，the support degree of the agriculture mechanization from the government，the degree of farm machinery socialization service，the net income per capital of the peasant，the education level of peasant.The paper uses gray system theory to analyze connection among the key point of the present mechanization of agriculture development.The conclusions of comparisive research indicate that the degree of farm machinery socialization service and the agriculture mechanization level is highly related more and more.