In recent years, extensive research and development have been carried out for devices and software that interact with the virtual reality environment. The Omni-directional treadmill (ODT) lies among such devices; The ODT is an assembled system that is comprised of segments which have independent belt. The ODT makes Y-axis motion by rotation of belts on each segment and X-axis motion by movement of segments like the drive of tread/tracks on excavator/tanks. So, the ODT can simulate a human locomotion such as walking and running, and provide a two-dimensional locomotion interface function for interacting an avatar in the virtual environment and the user in the real environment. Existing ODTs are heavy, complex and exhibit low power transmission efficiency. Their substantial drawback is limitation of rapid acceleration and deceleration, which make them inadequate for applications that require high acceleration and deceleration, such as training of soldiers in virtual environment. To overcome these drawbacks, a novel design of the Omni-directional treadmill is suggested in this thesis. The Fast Omni directional treadmill(F-ODT) that can make Y-axis motion, by means of a geared mechanism using a proposed Omni-pulley and X-axis motion, which uses simple coupling between the segments, driving part and light power transmission component(high tension timing belt). Therefore, the advantages of our proposed system are its simplicity, lightweight and that it can produce a high power transmission efficiency based on the suggested Omni-pulley mechanism. So, we designed an Omni-pulley, unit segment and system, and did the structural analysis. Besides, we performed the dynamic analysis of our design using simulation program ADAMS and calculated the drive power, and selected the required drive motor based on these results. Furthermore, we developed and drove a prototype of the designed system and measured the velocity, noise of Y-axis drive, and could discover a capability of system. The proposed device will be used as locomotion interface platform in various virtual reality environments such as training of soldiers, gaming/educational experiences and gait rehabilitation. Future task is implementation of the whole system based on suggested design.