Abstract: In view of problems of high cost, poor mobility and limited coverage of mine gas monitoring adopted by wired sensor network, a ZigBee wireless sensor network system for mine gas monitoring was designed. Sampling nodes are used to collect underground gas concentration real-timely, the collected data is transmitted to sink nodes with ZigBee protocol.After the data is gathered by the sink nodes, it is transmitted to embedded gateway. At last, the data processed by the embedded gateway is transmitted to mine monitoring center, so as to realize real-time display of mine gas concentration. The experimental results show that the system has high reliability, good real-time performance and wide coverage area.