This paper is the Guangzhou municipal government office building energy-saving technology application and the potential First view of the current large-scale public buildings in China features high energy consumption, particularly office buildings, some government agencies, high-grade office buildings, star hotels, find the kind of large public buildings Daozhi key factor in the high energy consumption, and then analyze the energy-saving technology potential energy saving Finally, make up the national unit standards for building energy consumption, and with the international Large public building energy consumption mainly by the lighting power system, air-conditioning systems, lift systems, other electrical equipment, system components, this office building of Guangzhou municipal authorities as a research target, its energy consumption on-site research, collect some important energy consumption data and analyze it, find that kind of building air conditioning system is a major energy consumer, accounting for the entire building all the energy consumption of between 40% -60% Therefore, such buildings air conditioning system to analyze, to study the energy-saving potential as the key to solving the Building energy efficiency at home and abroad by reading the relevant literature, and government agencies in Guangzhou office of the specific situation, the transformation of its energy-saving technologies, energy conservation programs Key words: building energy, the Guangzhou government office buildings, air-conditioning system, saving potential