This paper presents a design scheme of the mechanical hydraulic system of the speed governing system of impulse turbine with 6 nozzles and 6 deflectors at Bulunkou-Gongge ' er Power Station in Xinjiang Autonomous Region. In association with the research achievements of high head impulse units, advanced hydraulic control technology is adopted in the manufacturing, testing and inspection of the design, which is qualified to be applied in engineering. The design includes nozzle control unit, deflector control unit, centralized control unit for accidental shutdown, and the structure design. This paper would be referential for the design of the speed governor of large-sized impulse turbine with multi-nozzles.