Abstract: SCADA (Supervisory Control and Data Acquisition) system is a comprehensive integrated system including many subjects such as computer network technology, database technology, computer graphics technology, digital electronics, automatic control technology etc. SCADA system of hydropower plant is specifically designed. Based on the construction of SCADA system at YAVUZ hydropower plant, this paper reviewed the international development of SCADA system of hydropower plant and presented research results. Further, base on research of SCADA system for hydropower plant, a method to use water effectively, i.e. water level regulation for small hydropower plant was advanced, for reference.