It has very important significance to assessing forest biomass carbon pool and its inter-annual variability accurately for the reveal the role of forests in terrestrial ecosystem carbon cycle and the rational utilization of forest resources. We are trying to explain the size of the biomass carbon pool and its inter-annual variability in China by reviewing the latest progress in the study of China's forest biomass carbon pool. The results showed that, (1) The biggest difference of China's forest biomass carbon pool in the same period between different researchers was 2813.5Tg, and the biggest difference of carbon density was 19.20Mg/ha. The differences between different researchers are largely the results of the difference in biomass estimation and coefficient of carbon. (2) In 1949-2008, the size of the biomass carbon pool decrease at first and then increase. The change of carbon density is fluctuant.
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