The article analyzes the negative relationship between technological improvement and farmers’ income from the theoretical and empirical aspects on the basis of the study of Huang Zu-hui and Liu Jin-bao. The difference between corn supply elasticity and demand elasticity is about 0.27 by econometric models which proved there is a negative relationship between technological advance and income growth. A theoretical analysis of this phenomenon on the basis of empirical analysis proves that corn is the agricultural product of lack of flexibility. So two aspects of measures to increase corn production and farmers ' income should be applied from reducing corn supply curve to the right margin and boosting its demand curve to the right.