本文利用双差分模型和面板数据模型对小麦、早籼稻、晚籼稻、粳稻、黄玉米、油脂业用大豆和食品业用大豆等七种粮食产品近十年的周度价格数据进行研究,旨在考察中国粮食最低收购价政策是否起到了对粮食市场的托市效应。研究结果显示,最低收购价政策对大部分粮食品种存在托市效应,其中小麦的政策效果最为明显,油脂业用大豆的政策效应为负,同样的政策对主产区和主销区的影响也有所不同。 This paper studies the weekly price data of seven kinds of food products such as wheat, indica rice, late indica rice, japonica rice, yellow maize, soybean oil for food and soybean industry and so on for nearly ten years using double difference model and panel data model, Investigate whether China’s grain minimum purchase price policy has played a prop up effect on the grain market. The results show that the minimum purchase price policy has the effect of propping up the market for most of the grain varieties. Among them, the policy effect of wheat is the most obvious, the policy effect of soybeans in the oil industry is negative, and the same policies affect the main producing areas and main selling areas Different.