Reburning technology is considered to be one of the most promising and cost-effective NOx reduction strategies for coal combustion systems. Although natural gas and coal have been the most widely studied reburn fuels, use of biomass in the reburning process is also attractive because of the nearly CO2-neutral character as well as the lower NOx and SO2 emissions of biomass, with respect to fossil fuels. Further studies on process evaluation and detailed characterization of biomass reburning especially on the semi-industrial pulverized-coal furnace, are required before large-scale biomass reburning implementation can be realized. In the present study, process evaluation for the sawdust, rice husk, and dry sludge reburning have been performed on a semi-industrial pulverized-coal single-burner furnace. The detailed O-2, NO, CH4, HCN, and NH3 concentration distributions in the reburn zone have been obtained through in-furnace measurements. The effects of the reburn fuel ratio and biomass carrier gas on the NO reduction efficiency were also evaluated and analyzed. The experimental results showed that 40-60% NO reduction efficiency has been achieved by different biomass reburning. Sawdust had the best performance for NO reduction; rice husk was in second place; and dry sludge was less effective. At least a 10% increase of the NO reduction efficiency could be obtained when the biomass carrier air was replaced by the recycled flue gas. The NO reduction efficiency increased with the increase of the reburn fuel ratio, but only slightly further NO reduction could be achieved with the further increase of the reburn fuel input. The results of in-furnace measurements showed that the major nitrogenous intermediate species observed in the reburn zone was HCN with the sawdust and rice husk reburning and was NH3 with the dry sludge reburning. The NO reduction process was greatly related to the concentration changes of O-2, CH4, HCN, and NH3 in the reburn zone. These key gaseous species played important roles in NO reduction. It is expected that this study provided wider knowledge of the characterization of the biomass reburning process and a useful basis for further studies.