Abstract: The gas desorption indicators can not only reflect the magnitude of gas pressure in coal seam and the speed of initial methane releasing rate,but also reflect the initial desorption characteristics of the cuttings.This paper discusses the desorption characteristics of index of drill cuttings absorption and release including Q₃,Q₂₀ / Q₃₀ under different pressures,and finally analyzes effect test indicators and critical value of regional outburst prevention measures in heading face.