Recently, local cases have appeared again in Beijing. The incident occurred in a Beijing wet market. The cause was initially determined to be infection caused by interpersonal transmission or environmental contamination of items. Seeing the words 'wet market' and 'caused by environmental pollution' force us to think deeply about the substantive issues behind these words. In many people's minds, the image of a densely populated wet market is that it is filled with the sound of vendors selling goods all year round. It offers a wide range of fruits, vegetables, meat, fresh products and other products. While providing convenience to citizens, it also produces cross-flow of sewage and noise pollution. , mosquito breeding, traffic congestion and a series of environmental health problems. These problems have essentially caused the agricultural and sideline products supply chain traceability system to be immature. To better improve the supply chain traceability system, it is necessary to ensure that companies accurately grasp product trends, so that products can be traced throughout the entire process, their sources can be traced, and their whereabouts can be traced. There are two issues that citizens are most concerned about when buying agricultural and sideline products. One is product quality; the other is legal rights protection. Once a product has quality problems and is purchased by citizens, or even citizens suffer losses or injuries due to product quality issues, the supply chain can Traceability systems become particularly important. Product quality issues are related to the safety and health of citizens. Through this system, we can find out where product quality issues occur (the information can be queried) (production is recorded), where they flow (the flow can be traced), and whether there is a timely recall. Products with quality issues (quality traceable) to prevent more citizens from suffering losses and injuries. Citizens can also actively use their mobile phones to scan the traceability code above to query product information. The company will upload the product information data to the product information traceability system, so that citizens can know the basic information of the product, production company information, testing information and other related quality and safety information. Information, the combination of these two systems makes citizens feel more confident when purchasing products.