本文将SITC3五位码3116种商品先分成技术特征不明显和技术特征商品两大类，然后利用k均值聚类算法为技术特征商品按其技术含量分类，利用肘函数确定最优分组数，构建了一个全新的贸易结构分析框架，分析了2000-2012年，12年间中国进口贸易的商品结构和技术结构。研究表明：（1）不论是中国进口商品结构还是进口贸易的技术结构都有明显变化，变化幅度均超过世界变动幅度，呈现出向世界收敛的趋势；（2）中国对初级产品特别是对资源型初级产品的需求增加明显，工业制成品占进口份额比例从80%下降至60%；（3）中国和印度的商品结构类似，对于初级产品的需求旺盛，商品结构介于日韩和其他发达国家之间，优于发展中国家，正值转型期；（4）中国进口贸易技术结构从“中间多，两端少”的情况向恒均衡发展，技术结构与较发达国家类似，但是与发达国家仍存在差距，特别是特高技术产品的进口份额上，差距较明显，表现出差距逐渐缩小的趋势。

This article will SITC3 five yards 3116 kinds of goods into the first technical characteristics and technical features of the product are two obvious categories, then use k -means clustering algorithm for the technical characteristics of goods classified according to their technical content, the use of toggle function to determine the optimal number of packets , building a new framework for trade structure analysis, analysis of the 2000-2012 years, 12 years, commodity structure and technical structure of Chinese import trade . Studies have shown that:(1)whether the structure of Chinese imports import trade or technical structure has significantly changed, the magnitude of change in both the magnitude of changes over the world, showing to the world trend of convergence; (2)Chinese primary products, particularly for resource-based significant increase in demand for primary products, manufactured goods accounted for the share of imports decreased from 80% to 60%; (3)the structure of similar goods from China and India , the demand for primary products strong, commodity structure between Japan and South Korea and other developed between countries than in developing countries, a positive transition; (4) the technical structure of imports from China," in the middle, less at both ends," the situation to the constant balanced development, technical structure similar to the more developed countries, but in developed countries are still gaps , especially on special import share of high-tech products , the gap is obvious , showing the gap narrowing trend.