Abstract: A method of rendering vector data over 3D terrain based on stencil shadow volume algorithm is presented，which can realize a high quality real-time overlay of vector data on three-dimensional scene.Since this is a screen-space algorithm，it is per-pixel exact and does not suffer from aliasing artifacts as texture-based conventional techniques.Besides，it is not restricted by the underlying terrain geometry and its implementation efficiency is independent of the complexity of the terrain data but only depends on the complexity of the vector data.The key techniques of the rendering of vector data over 3D terrain based on stencil shadow volume algorithm are detailed and the effectiveness of this method is test-proven.

Key words: Stencil Test, Shadow volume, Vector Polyhedron, Vector Data Rendering