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Based on the life cycle assessment method, this paper takes Shanghai taxi fleet as the research objective (traditional fuel vehicle (ICEV) and battery electric vehicle (BEV)). Under the condition of Shanghai energy structure, and combined with the actual application scenario of Shanghai taxi fleet, the study and prediction of carbon emission is carried out from three stages of manufacture, use and recycle. The research results show that: in the life cycle, under the current energy structure and battery technology of the taxi fleet in Shanghai, the carbon emission of BEV and ICEV will be at the same level at the mileage of 50,000 km. With the adjustment of energy structure, the progress of battery technology and the increase of the proportion of battery electric taxi fleet, the overall carbon emission of Shanghai taxi fleet will be reduced significantly.