Abstract. With the increasing demand for diversification, for example, the new mobile communications and real-time interactive multimedia communications, IPv4 will ultimately transit to IPv6 due to many of its problems, such as lack of address space, poor quality of services, complex configuration, poor mobility support and security. IPv6, comparing to IPv4, has many new features, the simplified IP header format, host address auto-configuration, authentication and encryption, and strong mobility support and so on. Since the early 1990s, countries, organizations, operators and experts all over the world have had a broad study of IPv6.