关键词: 碳排放；碳排放治理政策；投资供应商

Abstract: The capandtrade policy and the carbon tax policy are two typical carbon emission policies of the government. The effectiveness of carbon emission control policies is investigated based on investment differentiation of green technology level.A supply chain system consisting of a single supplier and a single manufacturer is established according to the correlation characteristics between market potential demand and carbon emission trading prices. This paper solves the investment， profit， consumer surplus and total carbon emissions of manufacturers in different models， and further compares and analyzes the above results.The correlation coefficient between market potential and carbon trading price significantly affects the scope of application of carbon emission policies. When the correlation coefficient is moderate， compared to capandtrade policy， carbon tax policy can increase manufacturers investment motivation and profits， increase consumer surplus， and reduce total carbon emissions. Further research has shown that when manufacturer purchases from supplier with high technical foundation， the capandtrade policy has greater advantages in investment and total carbon emissions compared to purchasing from supplier with low technological foundations; when manufacturer purchases from supplier with low technological foundations， the capandtrade policy has a greater advantage in profit compared to purchasing from suppliers with high technological foundations.

Key words: carbon emission; carbon emission policies; suppliers investment