Abstract：
This paper, taking wheat as an example, makes dynamic and static comparisons before and after the execution of crops’ minimum purchase prices, output gross of executive areas and non executive areas, structure and efficiency. The results show that: the effect of propping up the market of the wheat minimum purchase price policy is more obvious, the output concentration, acreage, yield, selling price and the returns to scale advantages of the policy executive areas have steadily improved; at the same time, the “reference price” function and radiation conduction of the effect of policy on non executive areas, make the effect of propping up the market overflow to the non-executive to a certain extent. Therefore, a moderate expansion of the scope and variety of crops’ minimum purchase price policy will have an important role in the protection of national grain security and the income raise of grain farmers.
2013 
