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Following the mainline of structural durability, this paper restructured the theoretical framework of life-cycle design (LCD) method, and set up the reliability and sustainability LCD objectives, including safety, serviceability, durability, economic impacts, environmental impacts and social impacts. The modified LCD method was carried out through the dynamic performance-based design concept. It solved the problems of vague concepts and repeated indicators in current LCD methods by setting up the sustainability indicator, and also replenished the contents of life-cycle cost (LCC) at the same time. The modified LCD index system possesses a more complete and reasonable framework, and can be applicable to a wide variety of structural types and service conditions. [ABSTRACT FROM AUTHOR]