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The co-combustion characteristics and the NO emission characteristics of pulverized coal/biomass blends at constant temperature were studied using a newly designed experimental system that can obtain the sample weight and the NO concentration at the same time. In particular, the effect of blending ratio, coal type, biomass type and temperature on the co-combustion characteristics and the NO emission characteristics were investigated. The results show that with the increase of blending biomass ratio, the burnout time moves forward and the NO emission ratio reduces. Blending biomass has an obvious effect on the combustion characteristics of nonflammable coal, but has little effect on the NO emission characteristics of coal with high ash content. At the initial stage of combustion process, the influence of biomass types on the combustion characteristics is not high. During the co-combustion process, the effect of blending biomass with high ash content on the combustion characteristics decreases gradually. The reduction of NO emission rate is significant when coal blends with high nitrogen content biomass. However, if the biomass has similar nitrogen content, the more ash content, the more the reduction of NO emission rate. The effect of temperature can be negligible at the initial stage of combustion process, but become obvious at the end of combustion process. In the temperature range of the experiments, with the increase of temperature, the NO emission rate increases gradually. [ABSTRACT FROM AUTHOR]