The study looked at how China's energy use and productivity changed from 2000 to 2010 in different cities. They found that energy efficiency improvements were a major factor in increasing productivity. Efficiency changes and technical progress both helped productivity grow, especially in the eastern region. The central and western regions had advantages in energy changes. To boost productivity, many cities in China need to improve their efficiency or technical progress levels. Technical progress will be crucial for China's productivity and sustainable development in the future.