Due　to　the　virtual　stamping　production　line　system　of　automobile　panels　with　large-scale　assembly　model,　the　modeling　method　based　on　one-level　assembly　relation　and　assembly　skeleton　model　was　proposed　in　order　to　improve　the　real　time　abilities　of　interoperating　kinematics　simulation　for　huge　data　digital　mock-up　under　virtual　environment.　Assembly　model　was　generated　by　motion　skeleton　model　and　sub-assembly　model,　which　was　composed　of　solid　model　or　polygonal　representation　and　its　assembly　skeleton　model.　In　order　to　avoid　repeat　restriction　and　the　complex　solution　of　kinematics　simulation,　those　components　with　relative　motion　in　the　assembly　model　needed　to　be　parts　or　products　of　only　one　level　assembly　relation,　i.e.　＂one-level＂assembly　method.　Assembly　skeleton　model　was　obtained　by　restructuring　the　assembly　reference　of　parts　and　reflect　them　on　the　virtual　models　in　order　to　make　models　become　parameterized　and　automated.　Motion　skeleton　model　described　the　motion　relation　of　parts　or　products　by　motion　pairs.　From　practical　application,　this　modeling　method　is　approved　validated.