Abstract: To solve welding workpiece model, it is important to study welding groove feature design. The design requirements of welding groove were analysed in the numeric CAD/CAPP/ROBOTICS integrated welding. The total scheme was desiged to real-ize the data share between CAD design environment and CAPP/ROBOTICS environment. Firstly a method to model typical welding groove based on groove feature library was given, then a better method to model universal weld groove driving by program developing based on CAD/CAM platform was provided.And the method of welding groove feature and weld feature recognition was put forward. Example proved that it is correct.