Aimed at the problems of complex NC code compilation and almost no expansibility and generality in the current WEDM numerical control system, a simple and clear NC code compilation scheme for wire cutting was proposed. Based on the NET development platform,by using C# development language, lexical analysis was carried out through regular expressions,and the grammatical analysis was carried out by using custom functions.The scheme can be used to compile simple plane graphics, tapered cutting and up and down special cutting.NET drawing function was used to display graphics, and the line and arc were interpolated through the pointbypoint comparison interpolation method to realize the simulation of the motion trajectory.