Abstract: The evaluations of carbon emissions of transportation modes were conducted from life cycle perspective.Carbon emissions measurement standard was defined and the passenger car mode was taken as an example to demonstrate the steps of life cycle assessment,namely the determination of system boundary,the emission list and the buildup of model.Carbon emission of passenger car mode was evaluated and the carbon emission evolution was also conducted.Carbon emissions of every mode of transportation were calculated including the bicycle,E-bike,bus,metro,taxi and car.The methods to low-carbon transport developments were introduced and the quantitative studies were conducted to evaluate the effect of administrative and charging policies on Green House Gases (GHGs) emissions based on the questionnaire survey combined with multinomial logit (MNL) model.