Setting three dimensional geological body as an example, this paper discusses VRML constructing virtual scene roaming and interactive technology.Due to the traditional three-dimensional making software such as AUTOCAD,3DS MAX can not be interacted in time, this paper totaly describes the principle for the VRML nodes,such as TouchSensor and Switch controlling the virtual scene,combined with Javascript and VRMLscript interface,we studies the method of dynamic controlling virtual reality scene. The model of 3d geological body is constructed on the Web for users on the Internet to provide convenience. This example realizes the interactive operation on virtual scene such as stratigraphic hierarchical display, drill simulation,coordinates and information querying, and other functions, always has obtained a good effect.