基于联合国 COMTRADE 数据库2002—2017年世界水产品贸易数据，比较分析了中国水产品NRCA和PRODY指数，并使用非参数估计的分布动态法分析了中国入世以来水产品比较优势的动态演变和比较优势水产品技术含量升级情况。结果表明：入世以来，中国水产品在国际贸易中具有比较优势，但比较优势在减弱；水产品分布在比较劣势的数目大于分布在比较优势的数目，比较优势具有较强的内部流动性；中国比较优势水产品主要集中于低技术型和中等技术型水产品，高技术型水产品较少，中、低技术型水产品并未向高技术型水产品升级。

Based on the world aquatic products trade data of the United Nations COMTRADE database from 2002 to 2017, the article compares and analyses the NRCA and PRODY indexes of Chinese aquatic products, and the dynamic evolution of the comparative advantages of aquatic products and the upgrading of the technological content of the comparative advantage of aquatic products since China's entry into the WTO by using the distribution dynamics method of non-parametric estimation. The results show that Chinese aquatic products have a comparative advantage in the international trade, but the comparative advantage is decreasing. The distribution number of aquatic products with comparative disadvantages is greater than that of those with comparative advantages, with comparative advantages having stronger internal mobility. Chinese aquatic products with comparative advantage mainly focus on types of low-technology and medium-technology with few high-tech aquatic products. Medium and low-technology aquatic products have not been upgraded to high-tech aquatic products.

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