This research work was conducted to evaluate generation aod emission rate of biogas from a tropical landfill site at Nakornprathom municipality in Thailand by using close flux chamber method. The experiment was performed by measuring volume of biogas from gas ventilation pipes laid to different depths of 1.5, 3, 4.5 and 6 m. in landfill cell and analyzing for their composition. The results were compared with biogas production rate obtained from batch experiment coriducted in the laboratory. The biogas samples collected at different depths of cover soil layer were also analyzed for their composition in order to estimate emission rate of biogas through final cover soil layer. It was found that volume of biogas from ventilation pipes was in range of 0.08 to 4.9 m³/d. Biogas was mainly composed of methane and carbon dioxide. The experimental results obtained from batch test were in accordance with the field measurements showing that biogas generation rate increased along the depth of landfill cell. They were found in range of 0.05 and 0.89 l/kg VS/day. Emission rales of methane and carhon dioxide through final cover soil layer were estimated to be 82.2 g/m²/d. An important factor affecting biogas emission was the occurrence of soil cracking when its moisture content dropped below shrinkage limit. This soili cracking promoted biogas emission through final cover soil layer.