Abstract: A universal off-line programming system of arc welding robot station(WROBCAM) was developed to replace the previous way of teaching and replaying the robot. It is composed of seven modules, being able to build the 3D feature-based model of weld workpiece, recognise and convert the geometric and technical information of welding seams, plan the welding process, load the workpiece onto robot simulation circumstance and simulate the processes of executing welding operations. The system uses SolidEdge as geometric platform, and OpenGL, Visual C++ as programming toolkit.