In response to the principle of achieving shared improvement through collaboration, relevant actions taken in the aspect of the digital education resources have become important contents and research highlights of the present information and communications technology (ICT) in education. After years of research and construction, digital education resources are still not fully valued. Even worse, comments such as “resource island” and “digital ruins” have emerged. This is mainly due to the fact that existing resource platforms lack sufficient openness and scientific correlation. This paper proposes a model of the educational resources open platform based on the PaaS structure. By combining the techniques such as dynamic geometry, computer algebra and automated geometric theorem proving, a dynamic mathematical educational resources open platform is designed and implemented by means of micro-service architecture. Moreover, the OAuth2.0 technology is applied to provide third-party applications and users with authentication and authorization, hierarchically customized source materials and the capability to edit dynamic mathematical contents. This paper proposes an overall design of the open platform, gives a hierarchical strategy and an authentication process for applications and user permissions thereof and introduces the process of customizing the open resources and the tools. Currently, the open platform serves a plurality of third-party applications and is widely applied.