Abstract: The paper introduced outburst preventing mechanism of advancing hole in coal seam,compared and analyzed three kinds of measurement methods of effective degassing radius of advancing hole for gas drainage,and selected method of drilling cuttings weight and gas desorption index of drilling cuttings for practice.The results of field application showed using the method of drilling cuttings weight and gas desorption index of drilling cuttings to measure effective degassing radius of advancing hole is simple and reliable.