Abstract: The pyrolysis properties of three tire samples were investigated by means of nonisothermal thermogravimetric analysis in N2 of high purity (99.99%) at heating rates ranging from 5K/min to 20K/min. The pyrolysis process of the samples from outer cover has two distinct phases with increasing temperature because of complex rubber ingredients in outer cover. The major rubber ingredient in inner tube is single and the pyrolysis process of the sample from inner tube has only one distinct phase. The temperature range for distinct weight loss of all three samples is from 600K to 800K, which corresponds to a tire conversion range of 0.2~0.8. The pyrolysis of the three samples can be described by the firstorder kinetic model and the related kinetics parameters of the samples pyrolysis were determined.