Abstract: The temperature curve of flue gas was fitted by the least square methods during the sintering process,and then 4 flexions of the temperature curve were calculated by solving a two-order derivative of the temperature curve.According to the migration law of each sintering zone,the temperature at the flexions can be obtained,which represents that the forefront of each sintering zone arrive at the sintering grate.As the arrival time of a flexion is known,the average speed at the forefront can be calculated.Multiplelinear regression and F-test were used to reveal the influence of sintering process parameters on the average speed at each forefront, and their relationships were proposed. Using these formulae, the BTP is stabilized by quantitatively adjusting the process parameters under the principle of energy saving and improving the average size of the sinter.