Abstract: Under the present situation that teach and play robot is used in the automatic welding,universal off-line programming system of IGM arc-welding robot was developed.The three-dimensional(3D) simulation of robot welding process is a graphic platform of off-line programming.A new development way had been put forward to realize the simulation system of 3D graphics, which was to develop independently an off-line programming system of the work station including an OLE item based on C/S structure.And no-slot integration of the three-dimensional graphic and topological information of the welding workpiece had been realized by COM interface.Under VC++ development environment,framework with three degrees of freedom,joint type arc-welding robot with six degrees of freedom and positioner with two degrees of freedom had been developeds by using OpenGL graphic developing instrument based on object-oriented programming.