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This paper mainly studies the impact of carbon emission trading policies on carbon dioxide emission intensity. Panel data from 30 provinces (municipalities) from 2005 to 2017 are selected, and the research methods of propensity matching (PSM) and difference method (DID) are used. It is found that the implementation of the carbon emission trading rights policy has a significant impact on carbon dioxide emissions. Compared with the pilot areas, the carbon emission trading rights policy can significantly reduce the carbon dioxide emission intensity in the pilot areas. Given this, on the one hand, it can be shown that certain emission reduction policies have a positive impact on reducing carbon dioxide emissions. On the other hand, it has certain practical significance for the unification of carbon dioxide emission rights in China and realizing China’s dual carbon goals.