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Fast routing is one of the bottlenecks affecting the fast manufacturing of electronic equipments. The three-dimensional auto-routing system ( 3DRS) of electronic equipment is designed on the of unigraphics ( UG ) which is a three-dimensional(3D) modelling software. 3D weighed grid is applied to mesh the 3D routing space of electronic equipment, the labyrinth algorithm based on grid is used to search the route of wire. In order to describe the non-structure questions of 3D cabling space of the electronic equipment, a routing knowledge base which contains EMC analysis primarily is also designed in the system to guide routing. Based on the powerful 3D modelling ability of UG. the system is developed using Visual C++6.0 which is a visible programming tool.