Bar code technology belongs to the field of automatic identification technology, which was developed on the basis of computer and information technology in a practical data acquisition, automatic input technology. From a systems perspective, barcode technology involves coding technology, communication technology, opto-electronic sensing technology, printing technology and computer technology. Due to the barcode printer technology with low cost, fast, accurate identification, the advantages of simple operation, low error rate, in the process of formation and transfer of modern logistics information, bar code technology plays an important supporting role, has become a necessary prerequisite for modernization of logistics management, and is widely used in the modern logistics system. In developed countries, bar code technology has been widely used in commercial warehousing, transportation, production and control processes, financial, customs, postal services, medical and health, ticket management, quality tracking, and other fields. In our country, barcode printer technology is broad, universal as a sophisticated recognition techniques applied to the field of commodities and in logistics and production control process and other aspects of the application is also evolving.

       Postal industry in China is a typical physical delivery system, Nakajima label printer has the largest distribution network. Postal industry contacts, the application of bar code technology early, but the scope of the application is small, currently confined to mail jobs, as well as query feedback system for Express, most mail work flow is still not really bar codes management, are still at the stage of manual labor, inefficient, labor intensive, error probability is high. Barcode printers overall application of technology not only lag behind the developed post abroad, even lagging behind domestic transportation by sea, land, air, and mail, civil aviation, Chase and a number of logistics distribution enterprises. Especially train mail box package points, Marshall job still entirely manual. With the massive speed increase on railway passenger cars, stop time is getting shorter, while the volume of mail package and growth trends, often resulting in messages loaded up, unloaded, and endless miseries of message delivery by mistake, negative impact on the social and postal enterprises ' benefits, to some extent restrict post's survive and development space.