The technology of biomass gasification for reburning was adopted and the experimental research on NO reduction by reburning of biomass gasification syngas with tar,produced from an updraft biomass gasifier,was carried out on a tubular flow reactor.The experimental results show that there is optimum oxygen content under a certain syngas flow rate.NO reduction efficiency increases with the rise of temperature,but soot generated leads to decline of NO reduction efficiency when oxygen is not enough under higher temperature.The effect of tar on NO reduction can be fully reflected by comparing the NO reduction tendency by using syngas with tar and light gases respectively.NO can be reduced efficiently by approximate 80% using the syngas with tar under the test condition,and is a proper way for the resource utilization of biomass.