The Web3D technologies make it possible to create Collaborative Virtual Environment (CVE) in the popular Internet, thus promoting the popularity of CVE scientific applications to broader areas and making it easily accessible to more online users. However, the scalability of a Large-scale CVE (LCVE) is still limited by the constraints in processing power and network speed of each participating host. In this paper, we propose an Intelligent Mobile Agent Framework for LCVE in heterogeneous internet environment. In our approach, the system functions are decomposed into independent and fine grained tasks. The tasks are modeled as intelligent mobile agents which are not bound to any fixed nodes as the traditional CVE architectures do. As the intelligent mobile agents can autonomously migrate or clone at any suitable participating host dynamically at run-time, the system workloads can be distributed more pervasively to avoid potential bottleneck. This improves the scalability of LCVE. Our exp...