With the rapid development of Chinese economy and acceleration of urbanization, farmland conversion trend is inevitable. In order to analyze the effects of economic growth to farmland conversion in China, the author chooses the data of building occupied land area, per capita gross domestic product, industrial structure, input-output ratio, consumption growth rate and urban and rural income ratio and establishes a set of regression model with the aid of SPSS software. From the result of the model analysis, we can conclude that the impact of economic growth on farmland conversion appears the inverted U curve. The rise of third industry and urban residents’ income will stimulate the demand for farmland.