The original coal powder preparation system used 3 sets of screw conveyor and 5 sets of electro-hydraulic push rod flat gate valve, which had lots of problems including complex process layout, large maintenance workload, high power consumption, kiln and calciner coal powder bunker control operation difficulty. After the reform, the new system is mainly composed of one through shaft screw conveyor, one adjustable three-way discharge valve and three electro-hydraulic push rod flat gate valve, which simplifies the original process system. It can be saved about 100,000 yuan from the annual maintenance cost, and 13,400 yuan from the annual power. At the same time, the kiln and calciner coal powder warehouse position adjustment is more flexible.