A virtual dismounting of river ship mechatronics equipment exam system was design and realization with compute simulation and ethernet network technology. Elaborate three-dimensional model of river ship mechatronics equipment as well as dismounting flash of model is made by the 3ds Max software. Virtual scene configuration, mounting step description, definition of dismounting restriction and dismounting flash play can be realized by XML and LUA script languages. According to the marine equipment manual and advice of senior engineers，a local area network of river ship mechatronics equipment examination was set up with the intelligent grade orithm and ethernet network technology.