This research paper presents the concept, design and construction of the device to thermogravimetric measurements and the results of tests carried out on wood pellets. The purpose of this paper is to study the characteristics and thermal degradation behavior of wood pellet for biofuel production via gasification technology. The elemental properties of the feedstock were characterized by an elemental analyzer while thermal properties were investigated using thermogravimetric analyzer (TGA). The gasification processes were being carried out at room temperature up to 900°C in the presence of nitrogen and air as gasification agent, gas flowing at 500 ml/min. The investigated parameters are particle sizes and heating rate. The particle size used in the range of 425 to 500 um. The heating rates applied was 10°C/min. Sample weight varied from 0.5 to 1 gram, and stainless steel tray was used for the test. The further part of the paper contains the results of the tests carried out on wood pellet in the form of a thermogravimetric curves. These studies are conducted by looking at opportunities to improve the energy efficiency of the gasification process of biomass.