Abstract: U-type ventilation method is used in 2-105 fully comprehensive caving working face in Hejin Tenghui Coal Industry,through the applicaiton of coal seam gas pre-drainage,extraction method by high location fissure boreholes and the "long-hole instead of roadway" gas extraction technique,so as to solve the operational and technical and difficulties of cross openning and sealing by using U+L ventilation method of the stoping working face.The practice resutls show that applicaiton of the integrated gas extration technique is not only reduce the roadway excavation,but also help for effectively reducing gas accumulation in the upper cornor of working face goaf under the gas extration operation with low negative pressure and large flow,compared with the other integrated gas extraction methods,the application prospective and economic benefits of "long-hole instead of roadway" gas extraction technique are both good.

Key words: Fully comprehensive caving working face, Long-hole instead of roadway, Gas extraction, Gas accumulation, U-type ventilation method