Abstract: This paper present a new approach which uses virtual reality (VR) to design spherical mechanism. VR is a new design interface, which can provide a three dimensional design space. The new approach allows a designer to freely place geometric models of movable objects inside an environment consisting of fixed objects. The fixed objects can either act as a base for a mechanism or be potential sources of interference with the motion of the mechanism. The approach allows a designer to perform analysis of a mechanism while giving consideration to the interaction of that mechanism with its application environment.