Abstract: ［Purpose/Significance］Studying the influencing factors of social network information diffusion of different themes helps to explore the paths of information diffusion of different themes, and provides practical guidance and theoretical basis for optimizing the diffusion scheme.［Design/Methodology］With the use of bibliometric methods, this study analyzed the hot issues of social network information diffusion. Additionally, topics were categorized through keywords clustering. Then related literatures were profoundly analyzed and sort out so as to explore the influencing factors of social network information diffusion under different themes.［Findings/Conclusion］Four themes including natural disaster, health and disease, product marketing, and sport and entertainment were identified. Scholars have various focuses in research objects, research methods and research theories under different themes. Moreover, nodes’ characteristics, information contents and network structures have different effects on information diffusion. ［Originality/Value］This study summarizes impact factors of social network information diffusion from the perspective of theme. Research key points and relevant theories were explored, which could further enrich the research system of social network information diffusion.

Key words: Social network, Information diffusion, Theme, Influencing factors