As China's power grid continues to improve the level of intelligence,maintenance and application level.Power dispatching automation system plays an important role in security,economic,efficient and stable operation of the smart grid.Based on the demand analysis of the mirror system,the main design principles are summarized and a mirror system architecture based on virtualization technology is proposed.The key technologies are designed and developed such as mirroring template,data agent and mirroring management.The practical application of mirroring system is given.