Abstract: Fugitive dust is an important link to control dust pollution in coal mine. In order to study the development process of mine dust and its influencing factors, the types of mine dust are determined as aerodynamic dust, impact mechanical dust and mechanical external dust from the phenomenon of dust emission. Based on the types of mine dust, the sequential images of various types of dust particles are observed by high-speed photography. Then particle trajectory and influencing factors in dust production process are analyzed. The data shows that the incident angle is related to the dust development process. That is to say, the incidence angle determines the fugitive dust types and dust emission. Especially, when the incidence angle changes in the range of 21 ° to 53°, the process of dust development is diverse and the maximum amount of fugitive dust is caused.