[Objective] This study aims to improve library services with the help of WeChat platform which helps readers retrieve data quickly and increase users’ loyalty to mobile library services. [Context] Most libraries’ WeChat platforms did not provide automatic or real-time services, which was also limited to human involved interventions. [Methods] The WeChat service platform was built with Apache Tomcat + JSP + MySQL architecture, WeChat API and library business systems API. [Results] The new system’s features include reader authentication, reservation of mobile devices, millennium data exchange and self-service FAQ. [Conclusions] The new WeChat library service platform could be further improved, which could provide some practical suggestion to other libraries.