Nowadays,human society has gone into the information age and the system age at the same time. In this paper,taking a new social media as a field of study and WeChat in full swing as the specific study object,WeChat social system is divided into some subsystems according to Hierarchical theory of system economics, and then discussed the hierarchical relationships between various subsystems. This paper analyzed the mechanism about WeChat social system by Hierarchical Transition Theory and completed hierarchical transition from technical aspect to economic aspect then to management. Eventually,this paper suggested that WeChat would be used in precision marketing and what the future development trends would be.%当今人类社会步入信息时代，同时也是系统时代。本文以社交新媒体为研究领域，以最近如火如荼的微信为具体研究对象，根据系统经济学中的层次结构理论划分微信社交系统，考究各子系统之间层次关系，根据层级过渡思想解析微信社交系统机理，完成由技术、经济到管理层面的过渡，最终得出微信作为社交新媒体工具在精准营销以及未来发展趋势方面的启示。
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