The cement grinding system adopts the double-circle flow process of "roller press + ball mill". During the operation of the system, the pressure loss of the cyclone cylinder is high, the water vapor in the discharge air duct is high, and the air intake of the powder separator is uneven. From 2020 to 2021, the system has been adjusted and optimized many times, the original six-barrel combined cyclone was updated to a single-barrel high-efficiency cyclone, and the O-Sepa type high-efficiency powder separator was replaced with an N-U type high-efficiency powder separator. The position of the process pipes such as the exhaust air duct and the outgoing air duct has been adjusted. After the renovation, the system resistance decreased, the dust collection efficiency of the cyclone was increased to 95.7%, the power consumption of the process was reduced by 2.4kW·h/t, and the power consumption of grinding was reduced from 0.65kW·h/t before the renovation to 0.40kW·h/t .