Before modification, domestic cement vertical roller mill TRMK5041 grinding system had issues of bad stability, low operation pressure, uneven distribution for resistance and low grinding efficiency. By improving the structure of the grinding area, widening the effective grinding area, increasing the hydraulic system cylinder size, adding grinding roller projection pressure, using low-resistance louver ring and optimizing the structure, locally modifying the circulating gas duct, reducing gas duct elbows, and applying classified grinding technology, the stability and grinding efficiency of the mill were effectively improved, achieving the goal of increased productivity and reduced consumption. After the modification, under the same conditions of cement composition and product fineness, the TRMK5041 cement vertical mill increased output by more than 10%, and the system's power consumption decreased by 4.0 kW?h/t, demonstrating significant improvement. The project had a short modification period, with a construction period of only 25 days and a high return on investment.