Abstract: In order to meet the needs of heterogeneous interconnection between Ethernet of coal mine and underground ZigBee WSN, the paper proposed a design scheme of WSN gateway for coal mine safety monitoring system. It introduced design points of system software and hardware frameworks, and extended operating system abstraction layer of ZigBee protocol stack Z-Stack without transplanting additional new kernel to meet real-time requirements of tasks of embedded gateway system. The test results show that the gateway implements communication protocols conversion functions between Ethernet and ZigBee WSN, which ensures real-time performance and reliability of data forwarding.