The computer monitoring system of Taleghan hydropower station in Iran adopts advanced hierarchical and distributed network structure, and its main network is the ring network of optical fiber. The SJK-8000 monitoring system, which has been newly developed by XJ Group Corporation, is applied to central control layer, and the Quantum PLC produced by Schneider with high performance, which is configured the mode of hot standby, is applied to the local control layer. The standard communication protocol of IEC60870(103，104)/61850 is adopted by the communication between different devices in main network, and the method of MB+ is adopted by the communication between LCU and other devices. Consequently, the target of realizing advanced automation control and competitive project can be ensured.