Abstract: In order to analyze the diffusion and migration law of transfer and crushing dust in fully mechanized coal caving face, the model was built according to the actual situation of the intake airflow roadway and the numerical simula-tion was carried out by FLUENT software. The results show that the main dust producing points in the intake air-flow roadway of the fully mechanized coal caving face are located at 1m of the reversed loader head and around the protective cover of the crusher, and the high concentration of dust is mainly concentrated at about 1m above the ground. The dust concentration in the dust center at the transfer point is high, and the dust rising height is about 0.5m. Therefore, the mist drops must be targeted when spraying for dust removal. The dust around the crusher protective cover is distributed in layers, and the dust concentration gradually decreases from the ground up. The dust escaping from the gap is far less than the dust generated at the transfer point. Overall, the dust starts up at 1m of the reversed loader head in the intake airflow roadway, and a high concentration of dust is formed at the bottom of the protective cover at central of the crusher and the reversed loader head. The dust concentration reaches the maximum at crusher, and the dust diffusion tends to be basically stable at the tail of the reversed loader finally. Therefore, the spray parameters of the spray system can be adjusted according to different positions during dust control.