The invention discloses a data security protection system based on an asynchronous remote image. The system comprises a log module, a snapshot module, a monitoring module and a replay module, wherein the log module completes modification of local data; the snapshot module takes a snapshot for the local data through a cow mechanism; the monitoring module constantly checks whether a master system has a new data change; and the replay module calls logs and data of the master system and performs replay operation on a slave system. The invention furthermore provides an electrical application system data protection method. The method comprises the steps that the monitoring module is started; the monitoring module notifies the replay module to perform data synchronization when discovering data update of the master system; and the replay module calls latest log information and performs replay and metadata synchronization; data in the snapshot in the master system is compared with data in the slave system, and data synchronization is performed. The remote image is constructed for a storage system, when a master data center is subjected to an artificial or natural disaster, data IO can be immediately switched into an image system, and therefore normal operation of a business system is guaranteed.