Abstract: Using a heating device with an inside content of oxygen of less than 2%，Chinese white poplar (Populus tomentosa Carr.) specimens were heat-treated at temperatures ranging from 170℃ to 230℃ for periods lasting from 1 to 5 h. Relationships between the chemical composition of heat-treated wood and treatment conditions were investigated. The results show that the amount of holocellulose and α-cellulose decreased，but that of lignin increased with increases in temperature and time during the heat treatment. Compared to the heating time，the heating temperature had a greater effect on the amounts of chemical composition. The critical condition for the marked changes in the amount of holocellulose and α-cellulose is the heating temperature of 200℃ for a period of 2 h. Using Fourier Transform Infrared Spectroscopy (FT-IR)，the analysis indicated that the intensity of the characteristic absorption peaks of cellulose and hemicellulose decreased and those of lignin increased as a function of increasing temperature and time. Based on our experimental data，regression models were developed to predict the change of chemical composition (holocellulose，α-cellulose and lignin) for different temperatures and times. 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