In today’s China, on the one hand, due to the process of rapid urbanization, the demand for building is increasing.On the other hand, because of the improvement of people’s living standard, the requirement of living condition is increasing rapidly. These two factors lead to the proportion that building energy consumption accounts for in society’s total energy use increase. Building energy efficiency becomes an important part of energy conservation. However, what is the tendency of China building energy consumption? What about the potential of building energy efficiency? This paper analyzes the demand factors of building energy efficiency, forecasts the further tendency of building energy consumption in China. Basing on this research, the author analyzes the results of implementing the measures for building energy efficiency, forecasts the potential of building energy efficiency in China, and provides the theoretical foundation for the country’s building energy efficiency policy.