This paper took climate change and low carbon economy development as the background. Based on the analysis of energy demand and carbon emissions in Chinese citiesstatus and development bottleneck,It was aimed at providing the path of low carbon cities. Then this paper showed the low carbon citys development prospect till the year 2030 in different scenarios using the concept of scenario analysis and decoupling theory,taking Jiyuan City as the case study. The conclusions are as follows: From the perspective of demand,the energy demand shows the growing trend in the BaU,LC and ELC scenarios,and a maximum trend in BaU but a minimum one in ELC scenario because of the different driving factors; From the perspective of consumption,the energy consumption per capita presents different changes in different scenarios,and the inflection point will appear by the year 2020 in LC scenario with the energy consumption per capita 16. 9 tce,and the value is still in a high level; From the point of view in emission reduction potential,there are still a large reduction potential in the LC and ELC scenario,for example,the emission reduction amount in 2020 will be about 741 * 10~4 t,and 1 790 * 10~4 t in ELC scenario. Based on the results of the scenario analysis in citiesenergy demand and carbon emissions, this paper gave some policy options and guides to low carbon citiesdevelopment. Firstly,the energy demand in the present rapid growth trend is not a preferred option in Jiyuan city,and the LC scenario and ELC scenario are significantly improved; Secondly, although in the strictest scenario,the index of per capita energy consumption in Jiyuan is still higher than the predicted value of other cities,but there are still challenges for the city because of its resources characteristics and industry positioning issues; Thirdly,the cities like Jiyuan whose economic growth has close connection to the industrial production,should focus on the pattern of transformation and upgrading in traditional industries in itsdevelopment on low carbon economy and potential release.