The traditional e-learning systems are generally less attractive to students due to their lack of 3-D immersion and real voice interaction. The technology of virtual reality can be exploited to compensate these weaknesses. We propose a realistic and interactive virtual English classroom entitled VEC3D by integrating vivid 3-D graphics and real-time voice communication. The goal of VEC3D aims to help undergraduate students develop the overall English communicative competence in listening, speaking, reading and writing.