[目的/意义]探讨社会资本对虚拟学术社区用户粘性的影响机理，对于虚拟学术社区在业内竞争中稳定用户群体且实现可持续发展具有重要的理论和实践意义。[方法/过程]从虚拟学术社区的用户个人感知视角，深度解析其社会资本的构成维度，以此为切入点，探究社会资本、知识交流效率、用户粘性的理论结构模型，分析虚拟学术社区中衍生出的社区成员个体知识权力的调节作用，并基于从典型虚拟学术社区平台获取的270份样本数据结果的相关回归分析，验证社会资本、用户粘性、知识交流效率以及知识权力之间的相互作用关系。[结果/结论] 研究表明：社会资本有助于增强虚拟学术社区用户粘性；知识交流效率完全中介社会互动关系、社会信任对用户粘性的影响，部分中介共同愿景对用户粘性的影响；知识交流效率对用户粘性的影响受到知识权力负向调节作用，即知识权力程度越高，知识交流效率将会对用户粘性产生负向影响。

[Purpose/significance] It is of great theoretical and practical significance to explore the influence mechanism of social capital on the user stickiness of virtual academic communities, which is to stabilize the user group of this community in the industry competition. [Method/process] From the perspectives of the users' personal perception of virtual academic communities, this paper made a deep exploration on its dimensions of social capital, as a breakthrough point to explore the theoretical structure model on social capital, knowledge exchanges efficiency, user stickiness, and analyzed the adjustment role of the individual knowledge power derived from the virtual academic communities. The relationship between these variables was verified by the regression analysis of 270 samples data from the typical virtual community platforms. [Result/conclusion] The research shows that social capital contributes to the user stickiness of virtual academic communities. The knowledge exchange efficiency plays a complete mediation role between social interaction, social trust and user stickiness, and plays a partial mediation role between common vision and user stickiness. The influence of knowledge exchange efficiency on user stickiness is negatively regulated by knowledge power, that is, the higher the degree of knowledge power, the higher the efficiency of knowledge exchange will have a negative impact on user stickiness