With the economical development and improvement of people’s life level in China, building energy consumption rises rapidly. So building energy efficiency plays an important role in Chinese energy efficiency strategy. Among which public building efficiency is more important than other parts. Present the status quo of public building energy efficiency and government procurement. Discuss the crucial instruction and demonstration effects of government energy efficiency on public building energy efficiency by use of Keynesian multiplier. Synchronously consider government energy efficient procurement is one of the methods to innovate the public building energy efficiency mechanism. The government energy efficient procurement encourages the production and distribution of energy efficiency equipment and engineering. On the meantime, the goals of reducing public building energy consumption and improving the quality of indoor environment could be achieved as soon as quickly.