Abstract: Carbon cycle has an important influence on global climate change.In recent years,the research of forest ecosystem and carbon cycle has become one of global research focuses.Especially at present,carbon peak and carbon neutralization goals have been included in the overall layout of national ecological civilization construction,and after that green low-carbon circular economy will be comprehensively promoted,which puts forward important goals and research topics for China’s forestry development and ecological construction.How to deal with the relationship between forest ecology and carbon circulation is of key significance.The paper introduces the carbon cycle of forest ecosystem on the basis of understanding the carbon circulation process,focusing on the role of forest ecosystem in carbon circulation and describing the important influence of various factors in forest ecosystem on carbon circulation,such as biomass,forest products,forest soil.The relationship between forest ecology and carbon cycle between carbon peak and carbon neutralization has been concluded,which provides a theoretical basis for the development of forestry ecology and the realization of carbon peak and carbon neutralization goal.