Abstract: Considering the fault self-healing ability of active distribution network and the independent operation of main distribution and dispatching system, this paper proposes a method to improve the active defense ability of active distribution network. The key technologies of this method include the data interaction interface design of the main dispatching automation system, the main dispatching forward data flow design, the dispatching reverse data flow design, and the remote control e-file security verification technology. This method has been applied in actual production, realizing full-automatic feeder automation (FA), comprehensively improving the fault collaborative disposal capability of the main distribution network, and efficiently supporting the safe, reliable and economic operation of the distribution network.