The quality assurance department adopts the professional testing equipment and system management system to conduct all-round quality control to ensure that the product meets customer needs and achieves zero defect factory. The testing equipment includes Japanese Mitutoyo three coordinates, profilometer, roughness meter, domestic image machine, hardness meter, air momentum meter and so on. The foreign body measurement room was established, and the foreign body was measured and analyzed. Advanced equipment can accurately measure the size of the workpiece, hardness, foreign material and other related testing items. The management system covers inspection, process inspection and shipment inspection. The monitoring methods include the first tail inspection, the X-Rs management chart, the CPK measurement analysis and so on. The system of quality management ideas and methods to ensure early detection of abnormal, rapid response, and improve countermeasures.