Abstract: 【Objective】In order to understand the biomass allocation pattern of main conifer species in the Altai mountains.【Method】Based on the sample wood data which measured from Picea obovata and Larix sibirica in 2012 and 2013, the changing law of biomass proportion of different organs was analyzed from age, DBH and the forest canopy. 【Result】The proportion of biomass of trunk which accounts for whole tree in Picea obovata and L. sibirica, was 48.1% and 61.9% respectively; The proportion of biomass of branches and leaves which accounts for whole tree in P. obovata was higher than that in L. sibirica. The proportion of aboveground biomass accounts for whole tree in two conifer species was 79.8% and 79.5% respectively, the root shoot ratio of P. obovata and L. sibirica was 0.268 and 0.270 respectively. With the increase of the diameter class, the biomass proportion of the trunks in P. obovata increased, the biomass proportion of leaves and roots decreased and the biomass proportion of branches varied slightly. With the increase of the diameter class, the biomass proportion of the trunks in L. sibirica increased, but it slightly decreased when the diameter was over 30cm, and the biomass proportion of branches and leaves showed an opposite trend to the trunks. With the increase of the age, the biomass proportion of the trunks in the two conifer species increased, the biomass of the branches and leaves decreased. With the increase of the age, the biomass proportion of the roots in P. obovata decreased, and the biomass proportion of the roots in L. sibirica decreased initially and then increased. With the increase of the canopy density, the biomass proportion of the trunks in P. obovata increased and the biomass proportion of branches, leaves and roots decreased. With the increase of the canopy density, the biomass proportion of trunks in L. sibirica decreased initially and then increased, the branches and roots showed an opposite trend to the trunks and the leaves slightly decreased.【Conclusion】 The biomass allocation ratio of P. obovata and L. sibirica showed trunks ＞ roots ＞ branches ＞ leaves trend. With the increase of the diameter class, age and canopy density,the biomass allocation ratio of trunks in P. obovata gradually increased and the biomass proportion of leaves decreased, the ratio of branches and roots presented as one increase with the other’s decrease. The biomass proportion in different organs of L. sibirica slightly varied, and the overall trend was unchanged.