Carbon Border Adjustment Mechanism (CBAM) of EU requires that imports should buy and surround certain emission allowances according to the embedded carbon of certain importing goods and prices in EU carbon emission trading market, as a result paying special carbon costs and producing negative impacts on international trade in goods. In regard to its trade nature, CBAM is not tariff measure or domestic charges imposed on the importation. It is a importing measure which has quantitative restriction effects. In order to counter the CBAM and prevent the cross-border unilateral climate measure, China should deeply disclose its trade protectionism nature,actively work out to negotiate climate change cooperation with EU, make great efforts to construct legal system for green & low carbon trade and speed up to reform our domestic ca rbon market.