A cement production line adopts a cement grinding double loop flow semi-final grinding system composed of RP170mm-140mm roller press and [?]4.2m×13m ball mill. During operation, there are serious problems such as severe wear on the roller surface of the roller press, poor material extrusion effect, severe system crust formation, unreasonable arrangement of connecting air ducts between the powder selection machines, high resistance of the dust collector, and severe reverse grading of the grinding body in the second bin of the ball mill. The system process has high power consumption. By taking optimization measures such as reducing the initial roll gap of the roller press, strictly controlling the moisture content of raw materials, controlling equipment air leakage, adjusting the internal structure and grading of the grinding material, the system crust was improved, the system resistance was reduced, and the production capacity of the grinding system increased from 200t/h to 230t/h. The electricity consumption of the cement production process decreased from 29kW·h/t to 25~26kW·h/t, and the energy-saving and consumption reducing effect was significant.