Many business organizations have information systems, but most still operate separately as a silo. The problem that arises is that there is ineffectiveness in the process that is in the application. So the need for an integrated information system that can access two or more systems in the organization is needed. The system integration process is carried out using Enterprise Application Integration (EAI) method at the application interface level. This method is used to integrate academic information systems (SIAMIK) and library information systems (SIPERPUS). The results of this study are that both applications are connected without changing source codes from both applications. The integrated system design can facilitate the admin in the process of registering new users from the SIPERPUS application.