The source apportionment of carbonaceous aerosol in Hangzhou is carried out with aethalometer model, and the study is based on different light absorption properties of aerosols from different origins. Combined with aerosol time-of-flight mass spectrometer and data measured by aethalometer, the parameters of aethalometer model are corrected. The aethalometer data from Zhaohui environmental monitoring site of Hangzhou in 2015 is analyzed, and the contribution rates of biomass and fossil fuel burning to carbonaceous aerosol in Zhaohui are analyzed. The results show that the annual concentration of carbonaceous aerosol originating from fossil fuel in 2015 is 15.4 μg/m3, and the annual concentration rate is 71.8%. The monthly contribution rate of biomass burning to carbonaceous aerosol is 20%-38%. The minimum concentration rate appears in July while the maximum concentration rate appears in December, and the monthly data shows a gradient transformation. Traffic rush hours exhibit no effect on the mean diurnal pattern of absorption exponent, which means the carbonaceous aerosol may be introduced by long-range transport. The above results build the foundation for identification of Hangzhou energy consumption structure and alleviating air pollution.