Abstract: For problem that production data cannot be shared among control system and between control system and management information systems of pithead power plant of coal mine, a supervisory information system was introduced. The paper described concrete implementation schemes of key technologies in the system, including selection of real-time database platform, access of auxiliary control system and distributed control system and real-time monitoring of production process. The system improves production management level and work efficiency, and provides scientific and reliable basis for power plant management decision.