Rigid polyurethane foams were fabricated with five kinds of liquefied sugarcane bagasse polyols (LBP). The foams derived from sugarcane bagasse were investigated by thermogravimetric analysis (TGA), and the thermal degradation data were analyzed using the Coast-Redfern method and Ozawa method to obtain the reaction order and activation energy. The results indicate that the sugarcane bagasse-foams exhibit an excellent heat-resistant property, whereas their pyrolysis procedures are quite complicated. The reaction as first order only takes place from 250 to 400 ℃, and the pyrolysis activation energies vary from 20 to 140 kJ/mol during the whole pyrolysis process. The Foams derived from thermogravimetric analysis (TGA), and the thermal degradation data were analyzed using the Coast-Redfern method and Ozawa method to obtain the reaction indicates the sugarcane bagasse-foams exhibit an excellent heat-resistant property, while their pyrolysis procedures are quite complicated. The reaction as first order only takes place from 250 to 400 ° C, and the pyrolysis activation energies vary from 20 to 140 kJ / mol during the whole pyrolysis process.