Abstract: The relationship between the foam height and time has been measured for foaming processes caused by reducing Fe₂O₃ in smelting reduction synthetic slap. The foam behavior parameters under different condition were determined by means of experimental results and foam behavior equations. In this way, the foaming process caused by reducing Fe₂O₃ in smelting reduction process could be described quantitatively. The results provide necessary basis for controlling the foam phenomenon in iron bath.