Abstract: According to functional requirements of intelligent gateway in smart distributed network data acquisition system of hydraulic support, a design scheme of real-time gateway based on Cortex M3 was proposed, and designs of hardware and software of the gateway were introduced. The gateway realizes batch sampling of pressure data through RS485 or CAN bus, can upload data to the remote upper computer through Ethernet or Modem, and can offline backup massive sampled data using a SD card. The experiment result shows that the gateway has advantages of low cost, simple structure and high stability and reliability.