Abstract: The paper introduced design schemes of hardware and software of a monitoring subsystem of electro-hydraulic control system of coal plough. The subsystem can receive running parameters of coal plough and hydraulic support through CAN bus, display the parameters processed by ARM single chip microcomputer on monitoring interface with functions of fault detection and fault inquiry, and send the monitored parameters to control room on ground through Ethernet. The application showed the subsystem runs stably and responds quickly.