The destruction of tropical forests is a global problem. After being felled, burned and farmed for a short time, the forest coverage of Xishuangbanna in China has been gradually reduced and replaced by a large area of secondary forests in different succession states. However, the changes of carbon stock and carbon balance in secondary forests succession have been rarely studied. In order to further reveal the tropical forest succession for the influence of carbon accumulation in Southwest China,and to formulate a more scientific management measures for tropical forest management, taking tropical forest with compllicated structure, biodiversity and huge biomass as the research object, and using the measured data of three tropical secondary forest samples,the change of carbon reserve,net carbon accumulation,dead carbon loss, carbon sequestration, and other carbon dynamics of tropical secondary forest in different succession states were discussed. The results indicated that: *1) In the process of forest succession, the distribution frequency of forest diameter at breast height (DBH) gradually develops from the near-normal distribution to the skewness distribution of footpath, that is, with the progress of forest succession, the proportion of footpath trees became higher and higher. (2) The tropical secondary forests played an important role in carbon sequestration. (3) Small disturbances affected the carbon dynamics of the forest. Large disturbances, such as fire and logging, would lead to secondary succession of forests, with irreversible changes in the carbon dynamics of forests. (4) Drought events were the causes that affected the seasonal and inter-annual dynamics of litters, and were also an important factor affecting the carbon balance on a short time scale. (5) Large trees should be well studied for its significant important role in forest carbon balance.