Abstract: The land management scale of agricultural production is an important factor restricting the development of agricultural mechanization, researching the relationship between agricultural mechanization and agricultural land management scale has good reference and guiding significance to improve the utilization efficiency of agricultural machinery and the comprehensive benefit of agriculture, to accelerate the rural land circulation and to promote the moderate scale of agricultural operation. This paper taking qinzhou state of Tianshui in Gansu province for example, based on the index data of Agricultural land management scale and the agricultural mechanization during 2006—2016, analyses the scale of farmland and agricultural mechanization matching by using the coupling model. The results shows that the qinzhou state of farmland scale integrated level and comprehensive agricultural mechanization level increased in a fluctuant way state. Among them, the comprehensive level of agricultural land management scale is lower than that of agricultural mechanization during 2007—2010, the condition of idle agricultural machinery is more serious;during 2015—2016, the comprehensive level of agricultural mechanization showed a continuous growth trend from 1.00 to 6.00, and the maximum value of the comprehensive level of agricultural mechanization reached to 0.5799; The matching between agricultural land management scale and the level of agricultural mechanization is low. In 10 years, the matching of the relationship between the scale of farmland management and the level of agricultural mechanization was low, which from mild disorders across on the verge of disorders directly into the barely matching stage. In order to promote agricultural land management scale and the state of development of agricultural mechanization to highly matching, the cooperation between the farmers should be strengthen, reduce the purchase of agricultural machinery should be reduced, agricultural machinery and tools should be made full use in order to improve the utilization rate.