In the context of climate change, particular attention is given to carbon which is a major constituent of greenhouse gases (GHG). The forest has a very important role in mitigation of this phenomenon. But the assessment of carbon stocks in the forest ecosystems is not yet known satisfactorily, for countries with this heritage can access the "carbon credit" which is another way to take advantage of the forest. Very little information exists in the field of forest carbon about the Republic of Congo. The results of this study will be useful to the National Congolese Program about the carbon forest sequestration by MEFDD-REDD+/WRI Project which is managed by The Congolese Ministry of Forest Economy and Sustainable Development. Within the carbon market, this study (Carbon stocks evaluation in tropical forest of Congo) could allow the Republic of Congo to get the carbon credit.