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The gasification behavior of pine wood sawdust was investigated in CO₂ with different heating rates of 5, 10, 15, and 20 °C/min from room temperature to 1400 °C by thermogravimetric analysis (TGA) and mass spectrometry (MS). It was also examined under Ar to compare the differences observed under CO₂ at heating rate of 10 °C/min. Kinetics of pine wood sawdust thermal decomposition was determined by the models of FWO, KAS and master plot method. TGA results revealed different reaction sections from pyrolysis to char gasification under CO₂. The pyrolysis behavior was similar under CO₂ and Ar and had a similar energy required value about 590 kJ/kg from 250 °C to 420 °C. CO, CH₄, and H₂ were the primary gases obtained from thermal decomposition, and the amounts of which in CO₂ atmosphere were higher than those obtained in Ar. The average activation energy for pyrolysis under CO₂ was 184.72 kJ/mol.