Using the data of analytical wood, the characteristics of biomass productivity in the Larix gemelinii natural forest with different stand structure can be analyzed. The results were as follows: (1) The average biomass of the grass-larch forest with the age of 36~48 and the age of 56~65 were 43.2 t hm-2 and 39.1 t hm-2 respectively. Compare with the Ledum-larch forest with the age of 54~63, the average total biomass of them were 18.0% and 6.9% higher, the productivity were 65.8% and 5.0% higher, the proporti...