To lower dust concentration at fully mechanized caving faces, master spatial distribution rules of dust in various operation processes, and effectively direct dust control, the thesis, on the basis of gas-solid two-phase flow theory, carried out the numerical simulations with Fluent software to trail the dust distribution rules of coal cutting, support moving, sub-level caving, and transshipping at fully mechanized caving faces in single and multiple processes, and the results of which were made comparison with the site data. The findings were as follows. Coal-cutting dust spreads not only along the chute of shearer, but to footway, thus dust control near the drum and water curtain for dust reduction are necessary. Dust concentration of footway is higher than that of chute when moving supports, therefore, mist spray between supports should be equipped both in footway and chute. Considering the higher dust concentration of sub-level caving at the footway, dust separation should be done in the drawing opening. Higher air velocity at partial area of transpersite and a widespread effect of dust require the measures like sealing be adopted. In addition, full-section spraying devices should be installed between processes of sub-level caving and coal cutting.