In this paper, three principles of LCED are proposed on the basis of analysis of product life cycle, then the design processes of LCED is described in detail.

本文在深入分析产品寿命周期全过程的基础上，提出了LCED的三大设计原则，详细描述了LCED的设计过程。

LCED, which considers the product value in the whole life-cycle at the initial design stage, provides a series of tools and means for evaluating the quality of product design and product value.

全生命周期工程设计是一种在产品设计阶段就考虑产品整个生命周期内价值的设计方法。