Abstract: The air dense-medium dry coal separation technology is an urgently needed method for separation of coal in the water-shortage area in China and world. With this method,the separation process no needing of water,has high separation accuracy,less investment and good effect. The large air dense medium dry coal separation system developed by Beijing Bohou Screening Technology Co Ltd has been industrial used in Zhangji coal mine of Xuzhou mining group; It obtained breakthroughs and good application result.