Abstract: How to accurately measure the coal seam gas content in coal mine and further clarify the characteristics of coal seam gas accumulation is the key to the implementation of gas disaster control in mines or the exploitation and utilization of coalbed methane resources in coal mines. Based on previous research and literature investigation, the development of gas content determination method in underground coal seam was reviewed, and the research progress of this technology at home and abroad was summarized. The existing problems in the theory and engineering application of coal seam gas content determination were analyzed. It is pointed out that the precise determination of coal seam gas content is restricted by such factors as the mechanism of gas diffusion in coal dust and the mechanism of coal gas adsorption under the coupling of multiple physical fields gas have not been objectively revealed, and the limitation of the underground “fidelity” sampling technology. The overall development trend is prospected. It is considered that the measurement technology of coal seam gas content is developing towards the direction of intelligence and diversification. It is the main research direction to strengthen the theoretical research, improve the equipment as soon as possible, and develop the high precision in-situ measurement technology.