中文摘要：

基于投入产出表研究产业结构的方法有多种，可以从不同角度分析产业结构的特点．但存在一些不足。本文将社会网络分析引入到对产业结构的研究中，解决了其他研究方法的局限性。文中构建了产业结构网络模型，并基于中国9个年度的投入产出表分析了中国产业结构20年的变化。中国的产业结构变动具有阶段性特征，现阶段部门间的联系愈加紧密，但各部门在产业结构中地位的不平等性更加明显。工业部门的中心地位非常突出，服务业的地位在减弱，而且产业结构中的凝聚子群波动非常剧烈。

英文摘要：

Based on input-output tables, there are several methods to research industrial structure from different perspectives, which, however, have some shortcomings. This paper introduces Social Network Analysis into this field and solves the limitations of other research methods. With the social network analysis, this paper constructes a network model of the industrial structure, and analyzes China＇s industrial structure change using China＇s input-output tables. China＇s change of industrial structure has gradual characteristic. The connection between sectors is becoming closer and the inequality in the industrial structure is clearer. Compared with service sectors, the center position of industrial sectors is very outstanding. Meanwhile, industry subgroup has been fluctuating severely.