The optimal scale of farmland was an important theory which was the basis of farmland circulation and moderate scale operation, it’s important and profound meanings for the realization of the so-called “second leap of agricultural development in China”. Based on the statistical analysis of the survey data of 176 rural households, the cobb-douglas production function and the model of income maximization, this paper calculated the value of the moderate scale in agricultural production. The results showed that the fitting accuracy of C-D production function was higher, the coefficient of linear regression was 0.96, and the fitting coefficient was 0.93. The estimated value of α, β1, β2 , γwere 0.6198, 0.1335, 0.2699 and 0.8342, respectively. The moderate scale of operation for the average household and per labour force in Qianjiang City were 3.79-4.43 hm2 and 1.77-2.06 hm2, respectively in 2016. The current scale of operation of the average household and per labour force was 0.8977 hm2 and 0.4189 hm2, respectively. The verification results showed that the above model measurement results had a certain degree of rationality. According to the results of this study, some policy suggestions of fostering large-scale farmers as the important new agricultural management subjects an promoting the large-scale management of agriculture were put forward. |