Damages to the energy management system（EMS） due to disasters not only contribute to interruption of grid surveillance and control， but also make the grid operation out of control， exerting extremely serious influence on some grid areas it belongs to. The proposition of the smart grid has led to new requirements on the reliability of the smart grid and disaster recovery capabilities. The establishment of the EMS disaster recovery system is badly needed to improve the preventive ability of the state grid. First of all， the evaluation model for EMS disaster recovery system is developed followed by an optimization analysis of all the backup schemes available in the grid system. Then， an alternate monitoring/dispatch inter-backup scheme based on the unified dispatch data net is presented. In light of the scheme for integration inter-backup， the disaster recovery system structure is set up based on the cloud platform and such cloud calculation techniques as virtualization and service rendering capable of effective protection for current resources of disaster recovery software and hardware. In the meantime， the current resources of backup software and hardware are made compatible. To meet the needs of the four levels of backup basic software， basic service， support application and application service， a series of inter-backup system solution schemes based on the unified management interface， system incremental synchrony， grid centralized control and unified management of dynamic extent have been designed.