Abstract: In order to recover the coal resources left in previous Ankou Mine of Huating area, an underground coal gasification technology was applied to the secon dary mining and the power generation of the left coal.The underground coal gasification experiment was conducted on the left coal with the air continuous method, air a nd steam continuous method, air and steam two stage method, enriched oxygen and pure oxygen-steam continuous method and different gas injection techniques.The gas production and power generation features of the different gasification experiments with the left coal were conducted.The experiment results showed that the effectiv e component content and coal gas heat value could be improved with the steam and oxygen injected.With the application of the continues method and two stage gasific ation technique, the coal gas with heat value of 4.07 10.69 MJ/Nm3 could be obtained and could be the fuel gas for 2x500 kW gas-fired power generation unit.With the C omparison analysis of the gasification index and the comparison experiments of the site power generation, the low enriched oxygen (O2 volume fraction of 32%) steam continuous method determined would be a rational and economic gasification technique for the gas-fired power generation unit.