Based on the principle of thermal balance and material balance of lime face, the reaction and heat transfer process mathematical-physical model and the on-line monitoring model of the decomposition rate of limestone were set up. With this model, numerical simulation is used to analyze the effects of operational parameters on the process of lime calcining and to optimize it. By using visual basic program to communicate and program, the centralized management and automatic control of the lime face are realized. The software is put into practical production, which makes the lime face operate steadily and efficiently, and causes the increase in output and decrease in energy consumption.