Along with the development and advance of science and technology, the quantity demanded of high technology and high performance mechanical equipment, such as screw pump, screw compressor, elastic and plastic extruder, steam turbine, blast engine and turbine, and so on, is great more and more in present society. And the requirement of performance is high more and more. The application of these products is widespread in many major industry fields of national economy, including military, petroleum, machinery, aviation, energy, chemical industry, elastic and plastic industry, etc.. The key part of these products is the rotor with special complex helical curved surface and leaf blade with particular slender curved surface. The machining level of them makes effect on the product performance and quality directly. In this paper, modern manufacturing technology, which makes use of tool nose’s NC trace of revolving disk milling cutter and whirlwind milling cutter to envelope milling slender curved surface by combined moving of several coordinate axes on special NC milling machine, was studied. The principle of the new technique was represented. The application instances are given in this paper.