Abstract: Coal bed methane (also known as gas) drainage that through ground drilling fracturing has made considerable progress after years of development in coal mining area, however, the research on underground effect examination of ground drilling fracturing is still in its infancy. Based on hydraulic fracturing of ground gas drainage drilling, effect examination techniques and methods of underground fracturing are introduced emphatically. Distribution of underground fracturing zone and crack distribution law with ground drilling fracturing techniques and the effects of ground drilling fracturing on underground gas extraction and coal mining and tunneling are researched. A system of inspection that tests the fracturing effects of ground fracturing well are formed, which directs production practices of coal bed methane drainage with ground drilling fracturing.