Based on characteristic of gas at Wanfeng Mine, comprehensive utilization of low concentration gas was achieved with the help of existing infrastructure. On the process of generating power, transmitting safety of low concentration gas was ensured through water mist delivery system, steadiness of source gas was guaranteed with optimizing gas extraction system and extraction method, mine's heating needs was assured by providing heat source to water source heat pump with gas power waste heat. The environmental pollution caused by direct emptying was reduced by comprehensive utilization of low concentration gas, and electricity was saved as well. Meanwhile, it could also improve drainage through utilization, and improve utilization through drainage, which was surely beneficial to guarantee the coal safety production.