Method of life cycle assessment (LCA) was applied to evaluate the resource depletion and environmental impact potential of a thermal power plant employing circulating fluidized bed (CFB) combustion technology. A life cycle assessment model was constructed using Gabi5. 0 software to calculate global warming potential (GWP),acidification potential (AP), abiotic depletion potential (ADP),eutrophication potential (EP),human toxicity potential (HTP) and photochemical ozone creation potential (POCP). The results indicate that GWP and ADP are two main environmental impact factors in the power generation process,with the contribution proportion of 53% and 15. 05%,respectively ; environmental impact of boiler combustion is the highest among five units, occupying 77. 12% of the whole life cycle impacts, with the highest value of GWP, AP, EP, HTP and POCP in all of the six indexes. SNCR can be used to reduce NO_x emission of CFB boilers in the research and LCA theory is used to evaluate the environmental influence after using SNCR to compare with the former process.