In　this　paper,　CATIA　was　used　to　establish　the　parameterized　model　for　gear　driving　system　of　reducer.　The　Assembly　Design　workbench　was　used　to　complete　the　virtual　assembly　and　the　DMU　Kinematics　module　was　adopted　to　simulate　the　movement　of　gear　pair.　Finally,　finite　element　analysis　was　conducted　by　using　Analysis　&Simulation　module　to　simulate　the　actual　working　condition　of　gear　driving　system,　which　verified　the　rationality　of　parametric　model　and　the　accuracy　of　calculation,　at　the　same　time,　provided　the　reference　data　for　failure　analysis.　©　2011　Trans　Tech　Publications.