Source of statistical error of building energy consumption in Beijing

Based on the statistic data from the energy consumption of buildings in Beijing, analyses the effect of statistical error on energy consumption data of buildings. Puts forward the main sources of statistical data error, i.e. dissimilarity between thermodynamic system corresponding to total building energy consumption and relevant boundary, inconsistent metering devices for building energy consumption, un-united converting way for building energy consumption and insufficient number of statistic samples. Discusses the effect of building sample number on statistic result. Proposes the reasonable quantity of building samples for various buildings in Beijing.