Abstract: The development of consumer-oriented 3D graphics pipeline increases the performance of 3D graphics hardware. In this paper, we propose a new method of hierarchical depth occlusion TOIGP. Generally, the 3D graphics pipeline itself consists of two distinct stages: geometry process and rasterization process. TOIGP is abbreviation of Triangle Occlusion In Geometry Process. In that way, many triangles can be occluded much earlier than traditional pipeline in real-time. TOIGP has less computation of hierarchical depth test than ATI's HyperZ. And the simulation proves that even 80.5 percents of triangle shaded can be occluded in the 3D future mark scene. This method can be implemented by adding a simple hardware in 3D graphic chip pipeline. As a result, the performance can be improved highly with simple extra hardware.