With the development of computer and network communication, traditional business characterized by paper is gradually replaced by Electronic Commerce characterized by Electronic Data Exehange(EDI). Since 1990, EDI has been widely used in national business, and plays a more and more important role. However, EDI is still not widely used in China. The absence of appropriate EDI translating software is an important reason.. In this thesis, we first introduce the basic concepts, principles and system structure of EDI, as well as the standard architecture that must be conformed while implementing EDI. Then we analyze the exchange structure and message structure set by EDIFACT standards syntax rules in detail, and describe the functions and characters of mapping, translating and grouping during EDI file transforming process. We compare the difference between EDI VAN and Internet EDI, and point out the advantages of Internet EDI in efficiency and acceptability. In this thesis, we especially analyze the different security mechanisms of Internet EDI. According to the analysis of EDI file transforming process and other foreign EDI translating softwares, we build the function model and structure model of EDI translation, and design a EDI global translating software. We also realize several application systems based on this translating software, and the result is satisfying. This software supports Chinese character and Internet communication; it has simple structure and can be easily operated; it can be redesigned according to the need of users. This software especially satisfies the need of middle or small companies' implementing EDI.
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