The state of current China building energy use is presented. It is classified into the energy for space heating in North urban buildings, energy for space heating in Yangtze River area, energy for urban residential buildings, energy for non-residential buildings as well as energy for rural residential buildings. The characters, problems and key points for saving energy for each classification above were discussed in detail. Comparison with real building energy data in developed countries was also made in order to get clear idea on current China building energy state. It shows that current China building energy use is much lower than developed countries whatever in terms of per capita or in terms of building floor area. This is mainly due to the different lifestyles and different modes of building use. It is important to maintain the thrift mode in China in order to achieve the Chinese building energy conservation target. This should be the start point to design Chinese building energy strategy. As different lifestyles and different building use modes do need different technique measures, we should develop our own approach to realize their low building energy use target rather than follow the approaches that what happened in the developed countries.