In recent years, with the economic development and the improvement of living standards in China, the energy consumption has been increasing significantly. To create a sustainable society, it is important to clarify the energy consumption and CO₂ emissions in the residential sector, especially that in the urban houses because China is in the process of urbanization.
 Studies on the residential energy consumption in China have been carried out in Japan as well as China. Yoshino et al.¹⁾ have made clear the energy consumption of apartment houses for six Chinese cities by surveying; Zhang et al.²⁾ clarified the energy consumption for the capital cities in China in 1997 using the official statistics, developing a model predicting energy consumption in the residential houses in China; Ning et al.³⁾ investigated the structure of energy consumption using the Chinese statistics; Yu et al.⁴⁾ clarified energy consumption by questionnaire surveying and simulations for six Chinese cities; Ling et al.⁵⁾ investigated the consumption of electricity and gas for 23 areas in Beijing and made clear the average energy consumption except energy for district heating. All these studies can be classified into two methods: statistical and survey methods. With the statistical method, researches often face the problem of lacking the items needed in their researches; but with the survey method, it is difficult to tell if the results can represent the reality. Because the statistical method is based on large number of residents, it is used in this study. All the studies mentioned above have not been able to make clear the trend of energy consumption in the urban houses, nor the CO₂ emissions caused by the energy consumption.
 In this study, based on Chinese statistics, unit energy consumption for 277 Chinese cities is clarified during the period of 2002-2012. The emissions of CO₂ caused by energy consumption per household are also analyzed. The main conclusions of this study are as follows:
 (1) Energy consumption per urban household increases from 12.3 GJ to 23.1GJ in the period of 2002 - 2012. The percentage of each kind of energy was clarified;
 (2) The emissions of CO₂ per urban household increases from 1, 689 kg CO₂ to 3,559 kg CO₂ in the period of 2002 - 2012. The weight of CO₂ emissions caused by different kinds of energy resources was made clear;
 (3) Energy consumption and CO₂ emissions per household in the capital cities is 1.44-fold and 1.42-fold of the average, respectively.

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