To enable an online virtual university, a learning environment covering the entire spectrum of the learning and management process is required. However, constructing such an environment remains a hard work. One of the problems is to integrate heterogeneous software modules from different providers. In addition, these modules must constantly evolve. In this paper, we propose CUBES, an e-learning enabling system that focuses on the integrity, evolvabil-ity and extensibility. In CUBES, a special data exchange module(DEM), along with a global authentication module and a core user information management module, forms a basic supporting platform for the integration of upper educational application modules(EAMs), e.g. a large scale real-time interactive virtual classroom and a dynamic learning quality monitor. A universal portal helps to configure the integrated EAMs, providing a seamless learning environment for users. With the help of the supporting system and the universal portal, EAMs are easily combined together like cubes. Besides, popular e-learning standards, such as SCORM and CELTS, are adopted in CUBES to facilitate the sharing of learning resources, the interoperation of user information and also the integration of software modules.
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