The effects of pyrolytic temperature on fire-retardation performance of aluminum hydroxide in asphalt were analyzed based on pyrolytic behavior of aluminum hydroxide and kinetic model of bubble growth.The results indicate that the diameter of vapor bubble increases with pyrolytic temperature rising,and more combined water was decomposed from aluminum hydroxide at low temperature rising rate,so the fire-retardation effect was better.Three marked sequential stages of bubble moving speed were found that is quick decrease,relatively stable and complicated change with rate of aluminum hydroxide mass loss when the interface velocity of bubble was discussed,and the influence of heating rate on the transformation tendency of bubble moving speed was negligible.The radial speed of liquid around the bubble rapidly increases with increasing heating rate at the same pyrolytic temperature,so as to cause hot asphalt overflowing.It is suggested that the heating principle of low rate in the medium temperature stage,but high rate in the other temperature stages should be observed.It is obvious that the performance and manufacture techniques of fire-retardation asphalt are affected by pyrolytic behavior of metal hydroxides.