Aiming at the limitation simplicity geometry modeling method in virtual maintenance simulation, according to the equipment maintenance, put forward bidirectional virtual maintenance prototype (VMP) geometry modeling method. Then the multilevel geometry information and polygon VR geometry modeling methods were discussed. Taking a building model setting tertiary LOP node as example, the modeling conversion in virtual maintenance environment was researched. The result shows that the built geometry modeling is similar with reality equipment in instruction, function and behavior. It is opening and reusable.