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In recent years, effective methods of utilizing power generation using biomass have been studied a biomass power generation with an internal combustion engines. It is able to be used even on small scale. In addition, by using the ICE, it is possible to make the efficiency relatively high. The compact downdraft type gasifier was manufactured. It generates bio-syngas from biomass. A small spark ignition ICE (SI-ICE) was drove using bio-syngas as fuel. NO is included in the emission of the ICE. Due to NO is said that it pollute the atmosphere and destroy the ozone layer, it must be reduced. Many researcher study NO in emission with synthetic gas of CH4 mixed with H2. Their result is NO increased as H2 ratio increased. However, experiments with actual syngas is few. And, combustible gases in bio-syngas produced by our equipment are CO, H2 and CH4. Previous studies with synthetic gas of mixed CO, H2 and CH4 is few. Therefore, experiments are performed with actual syngas.