Abstract: By using four comparative advantage indices to analyze the changes of comparative advantage of 21 types of agricultural products, it is concluded that Anhui is still the export structure dominated by the main agricultural products in the past 20 years. Major agricultural products have stable comparative advantages, while nonmajor agricultural products have stable comparative disadvantages. From the perspective of trade supply, the change of Anhuis agricultural exports has not changed the fact that most agricultural products do not have comparative advantages, only some of them become less disadvantaged; from the perspective of supply and demand, the comparative advantages of agricultural products are still concentrated near the median point, and the positive changes are only part of the categories from the inferior to the lighter. It is necessary to construct the development strategy of classified trade of agricultural products based on comparative advantage.

Key words: agricultural trade, comparative advantage, index, kernel density

摘要： 运用4个比较优势指数，分析21类农产品比较优势变化后得出，近20年来安徽仍然是由主要农产品主导的出口结构。主要农产品类别具有稳定比较优势，非主要农产品具有稳定比较劣势。从贸易供给看，安徽农产品出口变化未改变多数农产品不具比较优势的事实，仅有部分农产品比较劣势变轻；从供求方面看，农产品比较优势仍主要集中在中值点附近，积极变化也仅是部分类别由劣变轻。需要构筑以比较优势为基准的农产品分类贸易发展策略。

关键词: 农产品贸易, 比较优势, 指数, 核密度