In this study, a real-time thermogravimetric analyzer was developed for providing insight into the reactivity and gasification process of pine sawdust. The mass loss rate of pine sawdust, syngas composition, and tar compounds in the gasification process were analyzed at different gasification conditions. According to the real-time thermogravimetric analysis, 800 degrees C of the gasification temperature, 0.25 of the equivalence ratio, and 600 kg/(m(2).h) of the gasification throughput were regarded as an optimum conditions for the gasification of pine sawdust in a fluidized bed gasifier.