Abstract:For the past few years, the problem of higher food prices has aroused the world's concern We have long worried about agriculture, treating it as the foundation of the national economy, but regret at the lack of support for empirical evidence By analyzing the data of the world bank in 2006,the author estimates the influence of agriculture It is found that the marginal utility of agriculture is always positive although decreases successively gradually On the eve of economic takeoff , the lower middle income countries have a bigger positive marginal utility of agriculture than others, so they ought to insist on the strategy of agriculture makes perfect