Abstract: To facilitate the layout and maintenance of urban underground pipelines,a new approach of photorealistic visualization for underground pipelines integrated into the video of real scene is presented.We exploit section cutaways perpendicular to the ground plane and tunnel cutaways along pipelines to reveal the underground pipelines.To exhibit the correct spatial relationship of the underground pipelines with the objects overground,we segment the screen space into four regions with different depth semantics.We then retain the important visual features of both underground pipelines and the overground objects within the particular region for depth cuing and utilize gradual mask for composition.Our approach does not rely on the geometric reconstruction of the 3D environment,and its GPU implementation achieves a real-time performance.