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As the korean economy and society continue to develop, the number of subways are expected to increase. This increase will demand greater heating and cooling energy as well as a sharp rise in overall energy consumption. This study was aimed at the development of energy conservation and analyzed for subways. This study shows the information, that is, tables, graphs and charts as possible of the trend in energy efficiency in subways between 1999 and 2001. We suggested the practical application for energy conservation methods and efficient energy use which was based on the investigations and analyses.