Joint Announcement on Climate Change makes it vital for Chinese cities to execute the work of carbon-cutting. The paper measures the quantity of direct carbon emission in 100 Chinese cities for the period from 2002 to 2012 in terms of the fuel combustion, industrial processes and product use,municipal waste incineration and carbon sinks in urban green space based on the method provided by Global Protocol for Community-Scale Greenhouse Gas Emissions. These cities are classified into three categories based on the curve of carbon emission per capita: high carbon cities, medium carbon cities and low carbon cities which cover 10,36,54 cities, respectively. The paper sets up two kinds of econometric models which are used to analyze economic development-emission relationships for specific emission cities according to Kuznets curve. We found that, this relationship is the inverted U-shape one in Chinese cities, but there are the huge different relationship between emission and income among the different emission cities, including at less five patterns: Top emission cities have the U-shape relationship, while the other four categories have the inverted U shape. These four categories have the different patterns with the different emission peaks per capita and total emission peaks. However, due to its emission increasing slowly with the income rapid growth for low-carbon group, its inverted U relationship is not very significant. And then,supposed each city's GDP growth rate per capita over the next 50 years,the paper estimates when to reach the emission peak per capita and total emission peak for each city. The findings are that only 44% of cities can achieve the target in 2030 if the present emission-economic pattern has yet been kept by all of cities. If the cities with the peak time of more than 2030 implement low-carbon development strategies, they will reach the peak before 2030 when emission peak values per capita for medium-and high-carbon group decrease by 10%,or ones for low-carbon group decline by 20%.