Given the fact that IPv6 technology has been defined by IETF as the standard of next generation for IPv4, which is an indispensable link of future network development, this paper bases on the status quo and issues of network security, comprehensively analyzes the fundamental reason for network security, and carries out analysis from basic principle, significant characters,security mechanism, security issues introduced from IPv6 and other aspects for network based on IPv6 architecture, studies and discusses on the security issues of network based on IPv6.