Abstract: The coal sample quality is the key technique to measure gas content directly. Aiming at the problems of the sampling process, the research was carried out about the applicability of SDQ-73 deep-hole fast sampling device. Through the first test conducted in the return airway (down section) of working face 27131 in Yanmazhuang Coal Mine of Coking Coal Energy Co., Ltd, the reason of less sampling effect was obtained, and the sampling technology was improved, by further tests after improved, the aspects of rapid, fixed, deep sampling had achieved for SDQ-73 deep-hole fast sampling device, it accorded with the sampling requirement of GB / T23250 "direct measurement method of underground coal seam gas content", which could be extended to use in similar coal mines.