Abstract: Life cycle costing (LCC) and life cycle assessment (LCA) are two key supporting tools for cleaner chemical processing industry. In this papper，the concept of environmental cost is introduced. An attempt is made to interpret the outcomes of a LCA in terms of environmental costs. This attempt ensures the environmental accountability of chemical products in LCC while LCA ensures their eco-friendly nature. Basing on this assume，the conceptual framework and implementation steps of product design are brought forward. This model incorporates the outcomes of LCA into the LCC practice，which provides useful information for rational chemical products design.