This paper proposes a decision support methodology for life cycle strategy in environmentally conscious product design. Here, decision of life cycle strategy includes decision of objectives of design modification and selection of appropriate life cycle options, such as upgrading, remanufacturing, maintenance, and reuse. Since main objectives of this research include offering simple and convenient tool to designers, quality function deployment is employed. The basic idea of this methodology is to analyze main disposal causes of a product by using "disposal cause analysis matrix, " which is proposed here, and to modify design of the product so as to reduce analyzed disposal causes. This will results in extension of product life and long-term usage of components. The methodology consists of three steps; namely, analysis of disposal causes of a product, selection of life cycle options and components to be replaced, and modularization of the product. This paper also illustrates a result of a case study using a cellular phone. This result reveals that the proposed methodology can successfully support the decision process of life cycle strategy.