Abstract: The rise of carbon dioxide concentration in the atmosphere is one of the main reasons for the greenhouse effect.The methods of carbon dioxide fixation were mainly studied in this paper,and put forward some methods and suggestions to strengthen carbon sequestration.The domestic and foreign carbon fixation methods mainly include artificial and natural carbon fixation.And the artificial carbon fixation includes physical carbon fixation method,chemical method and biological method.The artificial carbon sequestration method affects the balance of the ecosystem.The natural carbon sequestration includes forest ecosystem carbon sequestration,grassland ecology carbon sequestration and carbon sequestration in agricultural system.Natural carbon sequestration is a safe and effective carbon sequestration measure,but there are unreasonable land use and management.The agricultural carbon sequestration is the most practical and universal,and is most closely related to humans.It has the advantages of environmental protection and safety.The scope of agricultural production in our country is large,and the total amount of products is much.It impacts on the development of carbon sequestration deeply.However,the approaches improving the agricultural carbon sequestration efficiency also need to research.