1 457.2万美元/年。 The item of the biomass gasification and waste incineration combined power was briefly introduced. The evaluation method for environmental benefits of this combined power technology to reduce CO2 emission as well as the baseline item was confirmed. The CO2 reduction increment cost and environmental benefits were quantitatively calculated. In addition, sensitivity of fuel cost and discount rate and C emission coefficient were analyzed. The result showed that this combined power technology has great environmental benefits to reduce CO2 emission, compared to the baseline, its concrete benefit is 14.572 million U.S dollars per year.