Abstract: In order to meet the unified operation requirements of the Wudongde, Baihetan, Xiluodu, Xiangjiaba, Three Gorges and Gezhouba cascade reservoirs on the Changjaing River，it is necessary to integrate the dispersed existing hydropower operation automation systems at Yichang, Chengdu and Kunming to build a set of basin-scale cascade hydropower operation automation system with unified management and complete functions. We first sort out the status of remote disaster recovery, thus carry out design mainly considering three aspects: data acquisition and mutual backup, remote database replication and application mutual backup. Adhering to principle of self-reliant on key technology, we boldly adopt the domestic DMHS database remote replication technology to conduct remote real-time data synchronization. Compared with Oracle Goldengate database in terms of the replication efficiency of millions of data, its data performance is excellent and meets the needs of applications. After the transformation, the Three Gorges cascade hydropower dispatch automation system will form a unified application platform with features of unified platform and zoning application, which could provide references for transformation of other hydropower dispatch systems.