Abstract: In order to grip the distribution laws of the dust concentration in the fully mechanized caving faces with high inclination-angle, discrete phase model of dust grain is established based on theory of gas-solid flow. Combined with the actual characteristics of the fully mechanized caving faces with high inclination-angle, taking the dust movement produced during the process of cutting coal, software Fluent is used to simulate the dust movement at 2317 fully mechanized caving face in Getting Coal Mine, the distribution laws of the dust concentration movement in the fully mechanized caving faces with high inclination angle are summarized.