Adopt ISO9001:2008 quality management system. Do a good job of incoming inspection and intermediate inspection of purchased raw materials from the source. The first article confirmation shall be strictly implemented to eliminate batch quality accidents. The production process cultivates the self inspection and mutual inspection consciousness of employees, and the quality control starts from individuals. In case of quality accident, it is necessary to find out the cause, deal with the responsible person, educate the surrounding personnel and find out the improvement and prevention measures, otherwise, it will never be ignored. The engineering department spot checks the products according to the quantitative standard and the professional equipment to consider the process requirements, never relying on experience to determine. Carry out quality analysis and statistics every month, find out the quality control loopholes, focus on human and material resources to solve the root causes, constantly improve and improve the quality stability.