Barcodes began in the 1970s, has been widely used in the international community for all types of commodities, for trade activities and commodity management provides a great convenience, in 1988, the China Article Numbering Center was established, the bar code is also widely used in China in various fields, including in the application of publications, in April 1991, China was formally admitted as a member of the International Article Numbering Association, the bar code of goods The prefix code code is "690". Bar code, also called bar code, is a set of rules arranged, different widths, black and white, parallel neighboring lines, and with the corresponding characters composed of the code mark, used to indicate certain information. Bar code of a set of rules arranged in the bar, the meaning of empty: bar, bar code is the lower reflectivity of the part, that is, the black or colored stripes part; empty, bar code is the higher reflectivity of the part, that is, the white or colorless stripes part. Bar code is an automatic identification technology, is the use of photoelectric scanning and reading equipment to the computer to enter data into a special code, this code includes the product name, specifications, prices and so on. First, the use of bar codes function (a) automatically for reading recognition. As long as the scanning reader swept the bar code label, the computer can automatically read recognition, to determine the code of the goods, and then find the pricing, do the cumulative, etc., to summarize the settlement, the output of the total amount. Has the characteristics of fast, accurate. (B) can classify, summarize and analyze the information of commodity sales, which is conducive to the smooth progress of business management activities. (C) can be through the computer network in a timely manner sales information feedback to the production unit, narrowing the production, supply and marketing information transfer between the time and space difference. Second, the EAN commodity bar code EAN that is the abbreviation of the European Article Code, is also the abbreviation of the International Article Numbering Association. Participate in the Association of member states (or regions), known as EAN member states (or regions), and respectively, the provisions of the EAN bar code code, the EAN bar code is a universal commodity bar code. EAN bar code consists of a 12-digit product code and a check digit, the first three of the 12 digits of the prefix number, the middle four for the manufacturer's code, on behalf of an enterprise, the last five for the product code. The first three digits are only the barcode prefix code of the national area (EAM) members, and the quality of the goods has no relationship. It can only show that some large enterprises have taken the lead in adopting the bar code this kind of labeling. Commodity bar code refers to a set of rules arranged by the bar, empty and its corresponding characters composed of signs, used to indicate certain commodity information symbols. The bar is dark, empty for the color, for bar code reading equipment scanning and reading. Its corresponding characters by a set of Arabic numerals, for people to read directly or through the keyboard to the computer to input data to use. This set of empty bars and the corresponding characters represent the same information. Bar code technology is born with the development and application of computer and information technology, it is a set of coding, printing, identification, data acquisition and processing in a new technology. The use of barcode scanning is the general trend of future market circulation. In order to enable the free and wide circulation of commodities all over the world, enterprises, whether designing and producing, applying for registration or using commodity bar code, must follow the relevant provisions of commodity bar code management. At present, the commonly used code systems in the world are ENA barcode, UPC barcode, two-five barcode, cross two-five barcode, Kudumba barcode, three-nine barcode and 128 barcode, etc., and commodities are most often used is the EAN commodity barcode, EAN commodity barcode, also known as the universal commodity barcode, formulated by the International Article Numbering Association (IANSA), common in all parts of the world, is the most widely used international barcode. It is the most widely used commodity bar code in the world. EAN barcode is divided into EAN-13 (standard version) and EAN-8 (shortened version), and EAN-13 universal barcode consists of prefix, manufacturer's code, commodity code and check digit. The EAN-13 universal commodity barcode is generally composed of a prefix part, manufacturer code, commodity code and check code. The prefix code in the commodity bar code is used to identify the code of the country or region, and the right to assign the code is in the International Article Numbering Association, such as 00-09 on behalf of the United States, Canada, 45-49 on behalf of Japan, 690-692 on behalf of China, 471 on behalf of Taiwan, 489 on behalf of the Hong Kong SAR. Manufacturer code is empowered in each country or region of the article code organization, China by the National Article Coding Center to give the manufacturer code. Commodity code is used to identify the code of the commodity, the right to assign the code is exercised by the product manufacturer itself, the manufacturer in accordance with the conditions of the provisions of their own decision on what kind of goods in their own use of which Arabic numerals for the commodity bar code. Commodity bar code with a check digit at the end to check the correctness of the commodity bar code in the left from the first l-12 digital code. The code of commodity bar code follows the principle of uniqueness to ensure that the commodity bar code is not duplicated worldwide, i.e., there can only be one code for one commodity item, or one code can only identify one commodity item. Commodities with different specifications, different packaging, different varieties, different prices and different colors can only use different commodity codes. The standard size of the commodity bar code is 37.29mmx26.26mm, magnification is 0.8-2.0. When the printing area allows, should choose 1.0 magnification of the bar code, in order to meet the literacy requirements. The smaller the magnification of the bar code, the higher the printing accuracy requirements, when the printing accuracy can not meet the requirements, easy to cause bar code reading difficulties. As the bar code reading is through the bar code and empty color contrast to achieve, in general, as long as the contrast (PCS value) to meet the requirements of the color can be used. Usually light colors are used for the empty color, such as white, orange, yellow, etc., and dark colors are used for the bar color, such as black, dark green, dark brown, etc. The best color combination is black, white, and dark brown. The best color combination is black and white. According to the practical experience of barcode inspection, red, gold, light yellow should not be used as the color of the bar, transparent, gold can not be used as the color of the empty. EAN-8 commodity bar code refers to the identification of the numerical code for the 8-bit commodity bar code, expressed by the 7-digit code of the commodity item and 1-digit check digit composition. The birth of commodity bar code greatly facilitates the circulation of goods, modern society has been inseparable from the commodity bar code. According to statistics, at present, China has 500,000 kinds of products using the internationally recognized commodity bar code. After China's accession to the WTO, enterprises in the international arena is bound to win more room for manoeuvre. To be in line with international practice, to adapt to the needs of international trade and commerce, enterprises can not treat commodity bar code.