Abstract: Combined with production process of melting and casting and extrusion of oxygen free copper rods, the main factors affecting the quality of oxygen free copper were analyzed, and main factors affecting the oxygen content and the main reasons of the extrusion funnel defect in the oxygen free copper were discussed. And the technology measures were put forward to control the oxygen content and extrusion funnel defect of oxygen free copper rods in the production process. Finally, it was suggested that the oxygen free copper bars should be dealt with 100% ultrasonic testing.