Abstract: In this paper, the biomass and productivity of 22-year old Larix mastersiana plantation at an altitude of 2300m in Wolong Natural Reserve are studied. The biomasses of trees, shrubs, herbs, and dead branches and leaves in L.mastersiana stand were investigated using the “average standard tree”and“divided storeys”methods. The regression equation of the dry weight of each organ of L.mastersiana were derived as WT=0.0422 (D2H) 0.8533; WB = 0.0051(D2H) 0.8933; WBr = 0.0016 (D2H) 0.8519; WL = 0.0048 (D2H) 0.7641;WR = 0. 001 (D2H) 1.0755 The estimated total biomass of L.mastersiana stand is 135.17t/ha, the productivity is 10820.52kg/ha·a. Total aboveground biomass is l13.57t/ha, and the productivity is 8951.63kg/ha· a, in which the percentage of trunks, barks, branches, leaves and roots are 54.84% ,9.76%,15.77%,3.50%, and 16.13% respectively. The biomass percentages of L.mastersiana, shrubs, herbs and dead branches and leaves are 84.02%, 1.01%, 4.44% and 10.53% respectively. The productivity percentages of L.mastersiana,shrubs and herbs are 82.73%,3.17% and 13.86% respectively. Annual litter and drying trees productivity of L.mastersiana stand is 3996.14kg/ha·a, and the percentage is 36.93 %.