Abstract: In the intelligent process of hydraulic support electro-hydraulic control system based on CAN bus, there is a large amount of communication data, bus data conflicts increase, and high-priority nodes occupy the control of the bus, resulting in the hunger phenomenon of continuous failure of low-priority nodes, which seriously affects the real-time communication and hinders its intelligent process. Aiming at this phenomenon, this paper analyzes the hydraulic support electro-hydraulic control communication system in detail, designs CAN identifier and dynamic scheduling algorithm based on the system structure and information characteristics, and proposes a bus dynamic scheduling strategy based on EDF(Earliest Deadline First). The dynamic scheduling strategy can greatly improve the node hunger phenomenon, reduce the average delay of the system, improve the real-time performance of the system, and lay a good foundation for the realization of automatic unattended working face.