A typical case of an ultra-super critical (USC) power plant with flue gas advanced treatments was studied by a life cycle assessment (LCA) method to analyze its environmental impact. Emission data were traced back to where the flue gas was directly released when setting up LCA inventory, and the input data of removed waste gas were set as negative. Eco-indicator 99 and IPCC GWP 100a were chosen to evaluate the environmental impact and greenhouse gas (GHG) emission. The results show that climate change is the dominant factor with the life cycle GHG emission factor of 0.786 kg CO_2-eq·(kWh)~(-1). 99.9% of the damage on climate change comes from direct CO_2 emission in the burning unit. Denitration, dedusting and desulfurization devices can reduce environmental impact by 3.5%, 83.0% and 6.5%, respectively, and they have little damage on climate change. Sensitive analysis results indicate that auxiliary power and coal consumption are proportional to environmental impact with equivalent sensitivity. The removal efficiency has negative correlation to LCA results in flue gas treatment units. In addition, comparing to the advanced flue gas treatment technologies, the three general treatment units have higher environmental damage of 19.5%, 3.7% and 7.1%, respectively. This power plant shows competitiveness in both environmental and economic aspects.