The effect of the Positive List System on China's agricultural products is a major issue, both to policy makers and in academic circles. Based on data from China's customs trade database from 2000 to 2013, this paper adopts the product-level regression method to estimate the quality of China's agricultural products. It then analyzes the quality structure characteristics of China's agricultural exports from the aspects of trade and ownership. Finally, it analyzes the effect of the Positive List System on China's agricultural exports, based ...