[目的/意义]相比于以单纯的关键词统计排序为主的词频分析法，和以文献作为分析对象、需要庞大的引文索引作为基础的共引分析法，共词分析法具有一定的优势。因此，基于共词分析法来研究学科主题演化规律。[方法/过程]构建基于共词分析法的学科主题演化研究方法，包括4个模块，分别是：数据准备、演化阶段划分、主题识别和主题演化分析。[结果/结论]在主题识别阶段改进了词频g指数来选取共词分析的对象；在主题演化分析模块，提出从静态和动态两个角度来分析学科主题的演化情况，构建三维战略坐标来进行静态分析，并构建学科主题演化现象识别模型来进行动态分析。
[Purpose/significance] Compared with the word frequency analysis method based on the simple keywords statistics and the co-citation analysis whose analysis object is the literature and based on the huge citation indexes, the co-word analysis has certain advantages. This paper will research the laws of subject theme evolution based on the co-word analysis method.[Method/process] This paper built the method of subject theme evolution based on the co-word analysis method. It included four modules:data preparation, evolution phasing, theme identification, and analysis of the theme evolution. [Result/conclusion] This paper uses the improved word frequency g index to select the object of co-word analysis in the module of theme identification. This paper analyzes the subject theme evolution from both static and dynamic perspectives. This paper presents a three-dimensional strategic diagram for the static analysis, and builds the recognition model of the subject theme evolutionary phenomenon for the dynamic analysis.
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