Abstract: Coalbed methane(CBM) as a kind of unconventional clean energy, and CBM utilization project is still in its infancy. Energy conservation and environmental protection diagnosis is a important way to dig deeper into energy conservation and emissions reduction potential of the enterprise. Take CBM power generation project as a example, using the three steps method with remote initiatory diagnosis、field diagnosis、diagnostic analysis to diagnose the CBM power generation project. The energy utilization rate、energy loss of the main energy-consuming equipment and the pollutant emission were analyzed. And the retrofit schemes were also proposed. Finally, the suggestion was put forward: the low concentration CBM power generation should improve the economy by saving energy and reducing consumption, tapping potential and increasing benefit from power plant itself. The application of the three steps method in coal industry has the important significance of the energy conservation and environmental protection.

Key words: coalbed methane, power generation, energy conservation and environmental protection diagnosis, the three steps method, analysis