Abstract: In order to get scientific evaluation result of coal-fired power denitrification technologies,deviation degree theory was applied to construct subordinate function of interval index,besides,the game theory weighting method was used in index weight calculation and optimizing evaluation model of denitrification technologies.The model was applied to the pulverized coal fired boiler and fluidized bed boiler with low NOxburner of 660 MW coal-fired plant in China.Three kinds of denitration technology,i.e.,selective catalyst reduction( SCR),selective non-catalyst reduction( SNCR) and hybrid SNCR-SCR,were comprehensively evaluated. Results show that SCR technology should be preferred for denitration of 660 MW thermal power pulverized coal furnace with stable rated load under the condition of low nitrogen reformation in the furnace,SNCR should be preferentially selected for the fluidized bed boiler,SNCR-SCR technology can be used to realize ultra low emission.More importantly,the evaluation results are consistent with the feasible technical guide for prevention and control of pollution in thermal power plants,which verifies the rationality of the evaluation model.The evaluation results under 75% and 50% load show that SNCR-SCR technology should be preferentially selected for the pulverized coal fired boiler under 50% load.The evaluation results of the remaining low-load working conditions are consistent with the rated load working conditions,which provides a reference and theoretical basis for the evaluation and technical selection of denitrification technologies.