Quality control method is a quality management method to ensure product quality and continuously improve product quality. By studying and analyzing the distribution of product quality data, it reveals the law of quality differences, finds out the causes affecting quality differences, takes technical organization measures to eliminate or control the factors causing defective or unqualified products, so that every link of the product can be carried out normally and ideally in the whole process of production, and finally make the product meet the natural attributes and characteristics that people need, that is, the applicability of the product Reliability and economy.