Abstract: Gas injection technology can significantly improve the gas recovery rate, and is friendly to the environment. Based on the development status and main mechanism of gas injection, present status of coal seam gas recovery by gas injection technology utilization in China are compared and analyzed in three aspects, including gas injection location（surface and underground）, gas injection models（natural emission, negative pressure drainage, injection without drainage, injection with drainage and intermittent gas injection, etc. ）and injected gas type（pure CO₂, pure N₂ and mixed gas, etc. ）. At last, combined with the development situation of gas injection technology, the following development prospects were proposed: the gas injection technology to low rank coal seam, the gas injection technology to recover multi reservoir, the gas injection technology to the deep coal seam, the gas injection technology with new gas type and the injection technology combined with other methods.