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Nuclear power around the world has shifted to expand the lifetime of nuclear power plant as long as possible on the condition of safety and reliability instead of constructing new ones. In order to achieve the goal of life extension, the nuclear power plant all attach great importance to the life cycle management of critical equipment. LEA is a core of the life cycle management of critical equipment and an analysis strategy to improve the usability of critical equipment and achieve the maximization of life value and long period of revenue through optimizing decision-making process of critical equipment. In this paper, how to calculate the economic indicators involved in LEA is given. In ensuring the premise of reliability and safety, the model of economic analysis is proposed to the purpose of optimal cost. Finally, based on the model of economic analysis, building nuclear power plant equipment for life cycle management support system has been studied and the corresponding design and instances of system are given.