Based on land resources database, and the data of economy and population during 20062015 of Wanzhou in the Three Gorges Reservoir area, by using DPS software, this paper studied the influencing factors of agricultural scale management, by using AHP and entropy method, determined the comprehensive weights of each influencing factor, sorted and calculated the annual agricultural scale operating index, analyzed and compared the dynamic changes of agricultural scale management. The main conclusions include:1)The weight to present differences between analytic hierarchy process (AHP) and entropy method, but the sorting of factors reflected the consistency, so that the comprehensive value of the weight can be used to calculate the index of scale management.2) The sorting on influence factors of agricultural scale management is economy, efficiency, output, resource, and demographic factors. The agricultural investment factor has been associated significantly with economic development level of different regions, therefore, agricultural investment increases with raising the level of economic development, and agricultural scale operation index changes with raising the investment.4)As the rural population is reduced slowly year by year, per capita cultivated land increase step by step ,the one of dynamic changes provides a good basic condition for the scale management of agriculture. In general, agricultural scale operation index presents increasing year by year, after 2009, the growth rate was accelerated. Simulation curve shows that agricultural scale operation presents a good development trend under the comprehensive influence of various factors.