Using the System GMM and constructing economic growth and fiscal expenditure scale theory model, this paper considers the scale effect of the contribution of the agricultural infrastructure to the agricultural economic growth with the provincial panel data of Chinese gricultural infrastructure collected from 2000 to 2013. The results show that the scale effect exists in the Chinese agricultural infrastructure, and that effect of the northern region is much stronger than that in the south, and the agricultural infrastructure in South China is transforming from the scale economy to the diseconom...