Based on UG a modern wood milling cutter CAD system was researched and developed using Visual C++6.0,SQL Server and UG toolkits(UG/Open).This system musters query,type selection,design calculation and 3D modeling functions of modern wood milling cutters,and has friendly interfaces and nicer extensibility and transplant.The modern wood milling cutter CAD system is proved that it improves the design efficiency and accuracy of modern wood milling cutters.