| The sustainable development of civil engineering has become an increasingly outstanding issue, and the sustainability of bridge in China has a special significance. Since the 1990s, China's construction of bridge has entered into a boom period, the number of bridge built in China accounts for 30% to 50% of the total number in the world. As the society attaches the importance to sustainable development, life cycle assessment (LCA), an internationally recognized method to quantify the environmental impact of products'system, started to be used in bridge engineering.Based on the theory of LCA, this paper aims at providing a quantitative analysis system for sustainable development in bridge engineering. The bridge-LCA model can be used to guide the maintenance of existing bridges and provide support for designing new-constructed bridges.In this paper, goal and scope of bridge-LCA has been determined, as well as the collection and processing requirements of inventory analysis has been proposed. Besides, this paper respectively build end-point damage model for bridge-LCA environmental impact quantitative analysis methods which selected 3 categories of environmental impact (ecosystem, human health, energy and resources) based on eco-indicator 99, and build mid-point damage model for bridge-LCA environmental impact quantitative analysis methods which selected 9 categories of environmental impact (Global Warming Potential, Acidification potential, Eutrophication, photochemical smog, fossil energy, mineral resources, fresh water, soot and solid waste to analysis bridge environmental performance) based on traditional LCA.Finally, a case study was conducted to demonstrate the application of both models. A proposed bridge—Jialing Grand Bridge in Chongqing, was selected for the case study. Both the mid-and end-point damage models were conducted to evaluate the environmental impact for the bridge case. The comparative analysis of both assessment methods and results was also discussed.
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