High speed wire cut electrical discharge machining has been widely used in metal processing field,its machining accuracy and speed have continuously met the needs of industry development.But most is simple plane processing, the threedimensional curved surface machining can’〖KG-*2〗t be achieved,which seriously restrict the application range of wirecutting processing. A new type of spiral machining fixture was proposed, a rotation motion of the workpiece was increased. From the aspects of mechanical structure design, electrical control system, machining theory and programming, its processing principle was explained.By the fixture, the complexity of the processed parts is improved greatly and the development need is met.