Abstract: In the nitrogen atmosphere， thermogravimetry-mass spectrometry(TG/MS) was used in combination to compare the pyrolysis behavior of rice husk and rice straw at the heating rates of 5℃/min and 20℃/min， and the release rule of small molecule gas (CO，CO₂，CH₄，H₂) product with the change of temperature and heating rates was obtained. The results show that the pyrolysis process of rice husk and rice straw can be divided into dewatering and drying warm-up solution stage， volatile component precipitation fast pyrolysis stage and residue pyrolysis carbonization stage. The total weight loss rate of rice straw pyrolysis is about 75%， while rice husk is about 55%， and the index value of rice straw pyrolysis characteristics is higher than that of rice husk. The release intensity of ion current of main biomass gas composition (CO， CH₄ and H₂) in the rice straw pyrolysis process is obviously higher than that of rice husk. The pyrolysis kinetic parameters were calculated by using Coats-Redfern method. The apparent activation energy and volatile component initial precipitation temperature of rice straw are lower than those of rice husk， which accord with the results of experiment， and indicate that the pyrolysis performance of rice straw is better than that of rice husk under uniform conditions.

Key words: biomass, rice husk, rice straw, thermogravimetric-mass spectrometry, pyrolysis kinetics