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Energy is a nonrenewable resource. Hence, long-term sustainable development cannot be guaranteed by an increase in energy efficiency but to use the least energy as possible. Therefore, this article builds an index of low-energy development (LEDI) to describe the shift from high-energy development to LEDI. This research, which uses Chinese provincial data set, reveals that the LEDI of China is at the low level, but has a significant upward trend after 2005.