This standard describes in detail the instruments and equipment, determination process and determination method of measurement results for the determination of gas drainage radius in coal seams using the extraction volume method in coal mines. It is suitable for the determination of drainage radius in coal mines such as bedding drilling, cross-layer drilling and bedding directional long drilling. The standard ensures the accuracy and Reliability of the measurement process by citing GB/T 1227 Precision Pressure Gauge, GB/T 15663.8 Coal Mine Scientific and Technological Terminology Part 8, GB/T 23250 Coal Seam Gas Content Downhole Direct Determination Method and MT/T 28 Optical Interferometric Methane Measurer and other normative documents. The terms and definitions include clear definitions of coal seam gas drainage radius, measurement drilling, boundary condition drilling and gas content meeting standards, providing important technical support for coal mine safety and production.