Abstract: The operating conditions of the downward belt conveyor are very different from those of the upward belt conveyor. The load is transported through the belt, and the kinematic and potential energy are converted into electrical energy to feed back into the grid through the four?quadrant?frequency?converter. Through long-term practice and application management, some methods for solving major safety defects or hidden safety hazards such as downward belt brake, anti-stall, anti-breaking belt, and anti-material slippage were proposed, and the design requirements of the lower conveyor belt selection were supplemented and improved, which can be used as reference for the belt conveyor design, manufacturing, installation, operation and maintenance.