[Purpose/significance] In the era of mobile internet, people expect to acquire knowledge services through mobile terminals, and the mobile institutional repository is an important carrier and channel. As an office tool for internal communication, enterprise Wechat gradually integrates into the Wechat ecosystem and is applied by more units and organizations. [Method/process] Taking the construction of mobile institutional repository of China Academy of Information and Communications Technology (hereinafter referred to as “CAICT”) as an example, this paper analysed the application requirement, put forward the construction mode of “Enterprise Wechat + Web APP”, introduced in detail the process of system design and realization of main functions, and analysed the system effect and experience summary. [Result/conclusion] Starting from individual practice, this paper explores the mode of "Enterprise Wechat + Web APP" to build Mobile Institutional Repository, which is fast release, easy to use, high efficiency, low cost, universal and replicable, and has certain reference significance for other knowledge service organizations.