In　this　paper　the　base　conditions　for　realizing　the　clutch　parametric　and　intelligent　design　are　described　and　a　clutch　parametric　and　intelligent　system　is　developed　by　using　UG　OPEN　API　and　UG　KF　modules　of　UGNX　software.　The　structure　of　Logical　Definition　Model　(LDM)　is　established,　and　the　part　LDM　and　assembly　LDM　are　established　based　on　the　established　LDM　structure.　The　LDM　modeling　method　is　used　for　completing　clutch　parametric　design　and　knowledge　fusion　technology　is　used　for　knowledge　based　clutch　intelligent　design.　During　the　intelligent　design　the　representation　of　design　knowledge　are　realized　by　UG　KF　modules,　the　knowledge　reasoning　is　done　by　using　GA,　the　knowledge　acquisition　is　completed　through　the　engineering　database　of　clutch.