Abstract: This paper is designed to research the system of offline-programming,which consists of six subsystem of geometric modeling、welding orientation planning、welding parameter planning、robot program produced automatically、robot graph simulation and information transferrence.The interface of man and computer can be easily applied.This paper studies and re develops MRCWORD soft system,and realizes arc welding robot program produced automatically and information transferrence of computer and robot.Test welding on a typical workpiece shows that the system is feasible,programming efficiency is advanced remarkably and the seam quality is satisfactory.