| LS-WEDM plays an important role in the field of high-precision mould manufacture, shaped tool machining, hard-machined material and the machine of precise complex part. As the central part of the LS-WEDM machine, the performance of the CNC system decides the machine result directly. This paper studies present situation and development tendency of LS-WEDM,combined with practical requirement and analysed a large amount of materials,has done some works as followed:1 .According to total requirement of LS-WEDM has been analysed ,at the same time.plents of hardware and software resource in the PC,the speed of the MCS have been considered,a structure of PC+ MCS was put forward.2.Based on the analysis and required function of LS-WEDM,a total scheme has been put forward ,in this scheme ,there are four modules has been designed.3.Analysed the character of the interface,a new interface has been designed,which based on the coordinate parameters,at the same time ,the methods on how to designe the interface is introduced.4.Aanalysed the character of CNC program and the requirements of words and grammar check,a process of executing the program has been brought forward.and designed the words and grammar check program.5.Because the electrode has radius ,the center position of the electrode must be compensated,in this paper ,it pointed out the methods of calculate the coordinate of electrode thread center,judge the adapter style and coordinate of two linked curve.6.Analysed the interpolation character of Plane XY and UV,gave out the methods of calculalate the interpolation coordinate.and designed the interpolation program.
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