[目的/意义] 基于用户角度，对信息可信度评价进行研究，分析用户可信度评价行为，探索用户可信度评价指标体系，对信息可信度评价理论研究具有重要意义。[方法/过程] 采用扎根理论方法，从信源、信息内容和结构、媒介3个维度对问答社区语境下用户信息可信度评论进行编码，分析用户在真实情境下的可信度评价决策。[结果/结论] 用户更倾向于使用信息内容维度评价指标对信息可信度进行评价。单项指标使用频率较高的是准确性、逻辑性、客观性；联合指标是准确性与客观性、准确性与合理性。专业知识背景影响用户的可信度评价深度，专业背景与话题的相关性越高，可信度评论的影响力越大。
[Purpose/significance] Based on the user perspective on information credibility evaluation research, analysis of user credibility evaluation behavior and the user credibility evaluation index system, research on information credibility evaluation theory is of great significance. [Method/process] By adopting the method of grounded theory, coding the user information credibility comments from the information source, information content, structure and medium three dimensions in Q&A community,, this paper analyzed users' credibility evaluation decision in the real situation. [Result/conclusion] Users are more inclined to use the information content dimension evaluation index to evaluate the credibility of information. The accuracy, logicality and objectivity of the single index are higher. The joint index is accuracy and objectivity, accuracy and rationality. The professional knowledge background influences the depth of credibility evaluation of users. The higher the correlation between professional background and topic, the greater the influence of credibility review.
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