Abstract: In order to examine the applicability of underground coal gasification technology for coking coal, the pyrolysis test and model test of underground gasific ation were carried out.The results shows in the oxygen-enriched air gasification of coking coal, the optimal oxygen concentration was 60%，the gasification efficiency on this condition was about 80%, the heat value of the coal gas was about 8.36 MJ/Nm3 (2 000 kcal/Nm3) .The adhesion and expansion make the liquid plastic mass and melting ash attach on the coal well in the underground coal gasification process, which inhibit the reaction between gasifying agent and coal body, it was difficult to obta in good gasification effect. The contents of H2S, HCN, ammonia nitrogen, benzenes, COD, volatile phenols in the crude gas and gas condensate are exceed the national emission standards dozens or even hundreds of times, must be treated before discharge.