Abstract: China was rich in biomass resources with various types, which could be directly used for combustion. With the proportion of installed biomass power generation capacity increasing year by year, environmental protection requirements were enhancing, and the flue gas emissions control of biomass power plants was more strictly. The inital nitrogen oxide emissions of biomass boiler fluctuated greatly, the alkali metal content of fly ash in flue gas was high, and the humidity was high. The biomass boilers denitration technology was facing major challenges. Based on the comparative analysis of the characteristics of biomass fuel combustion and flue gas emissions, the development status, advantages, and disadvantages of the widely used traditional denitrification technology and the new developing denitrification technology were analyzed. Traditional denitrification technologies included low nitrogen combustion technology, selective catalytic reduction technology, and selective non-catalytic reduction technology. New denitrification technologies included plasma denitrification technology, ozone oxidation denitrification technology, biomass activated carbon desulfurization and denitrification technology, ZYY dry desulfurization and denitrification technology, low temperature oxidation absorption synergistic semi-dry denitrification technology, liquid biological calcium denitrification technology, and solid polymer denitrification technology. Moreover, the technical problems, cost problems, and operation period of biomass boilers technology were also discussed.