Based on large dust concentration in large mining height fully-mechanized face problem, the regularity of dust distributing of large mining height fully-mechanized face was studied. Based on the analysis of dust mechanism and source of large mining height fully-mechanized face, the dust concentration and dispersion of 5303 large mining height fully-mechanized face of Zhaozhuang Mine was measured, the results showed that diameter between 2μm and 5μm was the biggest percentage in 5303 large mining height, the process of coal and advancing support with the highest dust concentration were the key point of dust prevention and control.