Abstract: Experiments of peanut hull pyrolyis were conducted in a thermogravimetry(TG) instrument at the heating rates of 40℃/min and 60℃/min. In addition, peanut hull and surplus matters of the peanut hull pyrolyis at slow pyrolytic reaction stage(≥400℃) were analyzed by the Fourier transformation infrared (FTIR) spectrographic method in order to effectively control final temperature of biomass pyrolysis.Results showed that different heating rates of pyrolysis had no too much influence on the content of the surplus matters at different final pyrolysis temperatures, and FTIR spectrogram curves tended to be consistent. The contents of the surplus matters were changed with temperature before 450℃. Transmittance in the Fourier transformation infrared spectrogram curves had no obvious changes from 450℃ to 600℃. Therefore, the final reaction temperature of biomass pyrolysis should be controlled at about 450℃.