For problem that current research on dust control at transfer site of belt conveyor was mainly limited to specific measures such as dust removal or dust reduction, which results in unsatisfied dust control effect, influences of inducing air flow, shear air flow and traction air flow which formed during coal transportation at transfer site on dust generation was analyzed starting from dust inducement at transfer site. Take force of coal material at straight-line transfer site as an example, structure parameters of transfer site which influence dust concentration distribution were obtained. Numerical simulation of dust concentration distribution under different inclination, section area and section shape of transfer site was conducted by use of Fluent software. The results show that the larger the inclination is, the larger the dust distribution range and the higher the dust concentration at transfer site outlet is. The larger the section area is, the lower the dust concentration at transfer site outlet is. When section area is the same but section shape is different, dust concentration at transfer site with circular section shape is the lowest.