[目的/意义] 通过量化计量指标对研究主题的知识扩散进行测度与分析，客观地展现研究主题所包含的知识单元的扩散路径及其扩散规律。[方法/过程] 以Web of Science（SCI-E&SSCI）数据库核心合集为数据来源，通过被引参考文献检索方法，以J.E. Hirsch 2005年首次提出H指数概念的文献为被引文献，检索2005-2015间引用该文献的施引文献，得到样本数据。借助信息可视化分析工具CiteSpace分别进行关键词共现与文献共被引分析。将分析结果通过本文所提出的双阶知识扩散度指标Q算法进行计算，得到指标Q量变情况，并进一步分析H指数研究领域的演化扩散状况。[结果/结论] H指数研究主题的知识扩散的相关性随着流动阶层的增加而降低；H指数研究主题一、二阶知识扩散文献的主要研究方向不同，二阶文献更侧重于应用领域的拓展，这也是该研究邻域知识流动的新增长点；通过对H指数研究主题的分析，证明了本文所提出的双阶知识扩散度指标Q的准确性及科学性。
[Purpose/significance] We measure the knowledge diffusion of research topic by quantitative measurement index, and objectively show the path and its regularity of knowledge diffusion.[Method/process] The Web of Science(SCI-E&SSCI) database was used as the data source. Through the Cited Reference Search method and taking the literature of the H-index which was proposed for the first time by Hirsch J.E in 2005 as the Cite Reference, the literature was collected from 2005 to 2015 to obtain the sample data. With the help of the information visualization software CiteSpace, the key words co-linear analysis method and document co-citation analysis method are applied to the data. The results of the analysis are calculated by the two-order knowledge diffusion index "Q" proposed in this paper, and the quantitative change of index "Q" is obtained. Further analysis can explore the evolution and diffusion of H index.[Result/conclusion] The relevance of the knowledge diffusion of the H-index research topic decreases with the increase of the flow class. The main research direction of the two-order knowledge diffusion literature is different, and the second-order literature focuses on the application development,which is the new growth point of H-index study. The analysis of the subject of H-index shows that the accuracy and scientificity of the two-order knowledge diffusion index "Q"proposed in this paper are proved.
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