Abstract: In this paper the communion, model and standard of postprocessor software are studied. A standard cutter location file and a data-driven user interface are presented. Because the standard cutter location file is logical, other types of cutter location files could be changed into the standard type, APT cutter location file change system is designed. The data-driven user interface reduces user interface in the total system. Due to the separation of control information and user interface, the user interface system is constricted. In the user interface system, the user giving programming format increases the postprocessor software application. The system could produceISO or E!A tape of 21/2, 3, 4, 5 coordinates lathing machine, milling machine . drilling machine and tapping machine.

Key words: numerical cuntrol, post processor, cutter location file