Abstract: Wireless sensor networks (WSN) is a rising network technology, which integrates technologies of wireless communication, micro-sensor and network.It will impose a revolutionary impact on fields such as environmental monitoring, home automation, and logistics.The paper describes the features of WSN, analyzes the advantages of MSN technology for coal mine gas monitoring, discusses MSN hardware design principles, proposes MSN system for monitoring mine coal gas, and highlights the sensor nodes structure.Compared with conventional monitoring system, this system is characterizes by structural flexibility, great extensibility and accurate measurement.

Key words: Coal mine, Gas monitoring, Wireless sensor network, intelligentized node