Dust is an important factor affecting mine safety, and there are many influence factors about the dust content from the downhole gas. After analysis and with the experience of the mine workers, this paper selects twelve influencing factors, such as coal seam occurrence condition, to establish mine dust evaluation index system. To analyze the impact of various factors on the dust content of mine for research purposes, the paper uses the improved AHP method to analyze and contrast the above factors, obtain the mining methods, ventilation, affecting mining mechanization and dust philosophy and training for mine dust content of the largest. According to various factors to the influence degree of the dust content from the downhole gas, this paper puts forward the dust control scheme, and provides certain scientific basis for the controller.