Abstract:Harvested wood products (HWP), as one of the components of carbon cycle of forest ecosystem, plays an important role in the carbon balance between forest ecosystem and atmosphere. The carbon stock of HWP is also a part of greenhouse gases (GHG) inventory. Carbon stock of HWP in China was estimated by lifetime analysis method and step regression method based on Stock-change approach, Production approach and Atmospheric-flow approach which were established during Dakar Session in 1998 and a new hypothesis on application of Production approach was proposed. The results showed that the HWP was a carbon reservoir in China, and the carbon stock of HWP was increasing during 1961-2004. For the period of 1961-2004, the estimations were different by Stock-change approach, Production approach and Atmospheric-flow approach, the average increased amount of carbon stock-change in HWP were 11.73Mt·a-1, 9.31Mt·a-1, and 7.90Mt·a-1,respectively. The potential of emission reductions of HWP would increase through its substituting function in architecture area and its used life prolonging. Stock-change approach would be favorable to China based on the actual situations for estimate the carbon stock of HWP. Because of the difficulty and complexity in practice, further research should be done for the application of production approach.