The development of an intelligent plug-in electric vehicle（PEV） network is an important research topic in the smart grid environment. An intelligent PEV network enables a flexible control of PEV charging and discharging activities and hence PEVs can be utilized as ancillary service providers in the power system concerned. Given this background， an intelligent PEV network architecture is first developed， and followed by detailed designs of its application layers， including the charging and discharging controlling system， mobility and roaming management， as well as communication mechanisms associated. The presented architecture leverages the philosophy in mobile communication network buildup.