Abstract: Based on the analysis of the development process of deep trough belt conveyor, we analyzed the mechanism of deep trough belt conveyor with large inclination angle, and explained that deep trough belt conveyor was used on both thin and wide bandwidth. The article introduced the structure and application scope of the idlers which recommended by the national industry standard, and summarized the selection principles of driving devices, rollers, conveyor belts, cleaning devices, and the key techniques of setting reverse thrust rollers, head baffles, anti rolling device materials design.