Under the situation of Chinese economic construction to be driven by science and technology, the coordination development of economy, technology (technology innovation), and environment system (energy conservation & emissions reduction) of an energy-intensive enterprise will be the key factor. An evaluation model and indicator system of economy-technology-environment system about an energy-intensive enterprise is been built up then. The one, two and three dimension coordination degree of economy-technology-environment system of three famous steel firms in China are analyzed empirically and comparatively. the results show that, in the research period, although the economic effect of three firms was fluctuate greatly, the coordination degree of economy-technology-environment system of three firms appeared the trend of steady growth, and the coordination degree of technology-environment system all are good.