This　paper　aims　to　explore　the　level　of　residential　energy　consumption　and　CO2　emission　in　Chongqing,　China.　Using　statistical　data　from　the　on　demography　and　energy,　we　do　a　time　series　analysis　of　the　effect　of　urbanization　on　residential　energy　consumption　and　CO2　emission　in　Chongqing.　The　results　show　that　1)　Total　residential　CO2　emission　in　Chongqing　was　43.7　million　tonnes　at　the　end　of　2007.It　increase　52%　during　1998　~　2007.　Equally,　it　will　keep　on　increase　in　the　coming　future　if　people　do　not　take　any　actions.　2)　Urbanization　can　improve　the　residential　energy　efficiency　and　mitigate　CO2　emission　in　Chongqing.　3)　Main　policies　to　reducing　residential　CO2　emission　are　to　improve　residential　building　energy　efficiency,　reducing　the　use　of　tradition　biomass　and　produce　cleaner　electricity.　©　Sila　Science.　All　rights　reserved.