Abstract: Multi user shared virtual environment refers to a networked collaborative virtual reality system, users can interact with each other and control virtual objects by their graphic representation in the virtual environment. After analyzing some existing systems and the requirement of open and standardization of Internet, a reasonable scheme for multi user shared environment based on Internet is presented, which is called the multi user shared virtual environment framework （MSVEF）. The architecture and related collaborative protocol based on XML are defined in the MSVEF. A preliminary prototype application shows that MSVEF can effectively support the representation and collaboration of participants in a different platform in the same virtual scene.