Abstract: In order to improve the denitration efficiency under low temperature,ethanol / NaCl / NaOH were selected as liquid additives and the experiment was carried out on both a small scale denitration experimental system and a medi- um scale denitration experimental system. In the small scale denitration experimental system,ethanol can improve the denitration efficiency from 5% to 45% ,trace amounts of (20 ×10-6 ),NaCl improves the denitration efficiency from 800 ℃ . In the medium scale denitration experimental system,different additives enhance the denitration process differ- ently. Because of the best mixing condition,at different temperatures ethanol has different effects under different a- mounts. As the bed material containing Na, NaCl / NaOH does not have obvious effect on enhancing denitration process. The mixing condition between additives and flue gas,the composition of bed material,etc. make big differ- ences in using additives in CFB boiler and the experimental result.