The sustained rolling mill vibration on high-speed cold rolling mill or smooth mill could cause that periodicity sheet thickness difference or board light and dark stripes, or rolling processing interruption for the large vibration intensity. Dynamic load behavior of the rolling mill rack including the load magnitude and load property usually was the reason of the vibration, which caused the vibration modal with diversity and uncertainty. Three-dimensional solid modeling software and finite element analysis software had been used to realize computer simulation on deformation and stress field calculation of the rack rolling mill for completing rolling processing performance evaluation of the plate rolling mill. By strain gauges being layout to be half-bridge circuit in its suitable location to detect the one-direction strain on the rack, the loading capacity of rolling mill’s rack was studied for its dynamic characterization behavior. By extracting rolling force signal on actual measured and statistical analyzing calculations of experimental data on the plate rolling mill, rolling force load spectrum was obtained. Analysis model on rack was established in order to calculate and analyze mechanical and power parameters based on finite element method. It was used for improving dynamic design, also for analyzing mechanical and power parameters matching with increasing production and product variety under rolling schedule reinforcement. This study work provide theoretical foundation on ensuring stable operation of equipment, which was benefits on increasing production and product variety, even rolling processing potential scope.