LCA(Life Cycle Assessment) deals with the entire process, which affects the environment, from acquiring raw materials to an appropriate disposal of end products. LCA analyses the whole routine of the production of specific goods and services, and predicts the subsequent environmental impact. LCA includes the consumed energy, produced energy, and materials that are related to the process of obtaining raw materials, manufacturing, conditioning, delivering, using, recycling and disposal of products. Based on LCA, an objective and optimum environmental impact assessment can be carried out to improve the present environmental problems. LCA consists of 4 steps : setting the goal and scope of work, inventory analysis, impact assessment and the interpretation of results. The first step defines the frame of work to be done. The second step is making the list of work. The third step tests technically the qualitative and quantitative assessment of environmental loads and demand of energy and resources, that are determined through antecedent investigations. The final step combines the previous 3 steps, which could be conducted efficiently through the sensitivity analysis. In this research, LCA was applied to solid waste management programs of Nowon-Ku, Seoul, Korea.