Abstract: In order to solve the dust concentration too high occurred in the heading process of the fully-mechanized heading face in the coal mine and the dust affected to the safety production of the mine, a dust flow control field rationally set up with an air curtain dust collector was designed and was a dust removal system of a new high efficient air curtain dust collector to prevent the high concentrated dust air flow from the fully-mechanized heading face. Based on the fluid mechanics theory and the potential flow superposition principle, a mathematical model of the fan flow field within the limit space was established. In order to prove the rationally of the mathematical model, a mine simulated roadway with a width of 2.8 m, a height of 2.3 m and a length of 12 m was set up on the surface ground for the attenuation experiment of the air curtain jet velocity. The results showed that the outlet velocity of the air curtain jet was fast at the initial attenuation period and the late attenuation was slow down. The theoretical air velocity of the mathematical model was the same to the site measured air velocity and the mathematical model was correct and reliable. The overall radial jet air curtain would be required to be sealed within the space of the cross section, the site measured air velocity was over 2 m/s, could effectively control the outward emission of the dust particles and could be assembled and applied in the underground mine.