Commodity bar code is the basis of realizing commercial modernization and the ticket for commodities to enter supermarkets and POS scanning shops. In a scanning shop, when customers pay in front of the checkout counter after buying goods, the cashier can quickly input the numbers below the bar code into the computer as long as he gently passes through the platform equipped with a laser scanner with the goods with the bar code. Through query and data processing, the machine can immediately identify the manufacturer, name, price and other commodity information, and print out the shopping list. This can not only realize the automatic management of sales, warehousing and ordering, but also let manufacturers know the sales information in time through the production, supply and marketing information system. At present, there are about 700,000 POS scanning shops in the world, and more than 1,000 POS scanning shops have been built in China, including 33 in our province. This kind of POS shop is developing at an amazing speed. In fact, bar code has become a necessary condition for goods to enter the supermarket. Bar code is the only way for enterprises to improve market competitiveness and expand foreign trade exports. It is also a prerequisite to realize the automation of production and circulation, and it is also a technical guarantee for manufacturers to adjust their product structure in time. In recent years, many cities in China (such as Beijing, Shanghai, Fujian, etc. It is stipulated that all goods without bar codes are not allowed to enter the supermarket.