This article is to discuss and elucidate the standards for electronic book ordering as well as their applications. First, the article describes Electronic Information Interchange, including its definition, basic elements, benefits and historical development. Second, ANSI/NISO Z39.49, CNS13945, ANSI X12, UN/EDIFACT, and Book In-dustry EDI Messages Guidelines are respectively introduced. Third, the applications of the five standards are addressed. Finally, after summarizing the comparison among the five standards, the article makes some suggestions.