This paper is based on the extended theoretical framework of planned behavior theory, and constructs the theoretical model of the influence factors of WeChat academic information sharing intention with the "trust" factor simultaneously. The model was validated by collecting 213 sample data by questionnaire. The research shows that the two kinds of academic information sharing more are methods, tools, technical information and institutional information. WeChat public number and the circle of friends are the main sources which make the users get access to academic information and the circle of friends is the most important academic information sharing channel; Perceptual compatibility, the fun of helping people will positively affect shared attitudes. Self-efficacy can significantly positively affects perceived behavioral control. Self-efficacy and perceived behavior control have a significant positive impact on sharing intention.