The explosive increase of global data service requires that optical transport network provide flexible network configuration and efficient network protection

so the emergence of automatic switched optical network accords with this new development trend of optical network. ASON is a set of optical infrastruc- ture with high flexibility and extensibility

which can provide service at optical layer directly and can fulfill the requirements of subscribers

so it can solve some network problems perfectly

such as extensibility

manageability

subscriber bandwidth distribution and end-to-end network protection. This paper intro- duces the standardization status of ITU-T

IETF and OIF

then summarizes the fruit of ASON standard in China.