Abstract: Based on the investigation of 21 Pinus kesiya var.langbianensis plots in Puer,the biomass and carbon storage in tree layer,shrub layer,herb layer,CWD and litter were estimated by regression analysis and quadrat harvesting method,respectively,and the composition distribution characteristics were analyzed.The results showed that: the living biomass and carbon storage of Pinus kesiya var.langbianensis increased by different stand ages except the forests of 1619 years.The living biomass of Pinus kesiya var.langbianensis forest in Puer was 82.63197.89 thm-2(129.11 thm-2 on average).The biomass of the tree layer contributed to 97.86%98.38%,while shrub and herb only took up 1.62%2.14%.The lbiomass allocation in organs of different tree layers was stem(67.06%78.45%)branch(9.75%16.98%)root(10.14%13.85%)leaf(1.54%2.10%).Dead biomass was 4.588.94 thm-2,in which litter and CWD took up 81.58%96.91% and 3.09%18.42%,respectively.The biomass and carbon storage of the tree layers increased as the forests aged,from 101.76 thm-2 and 52.06 thm-2 in forests of 1213 years to 194.68 thm-2 and 97.03 thm-2 in forests older than 25 years. The high intensity of intermittent lumbering strongly affected the biomass and carbon storage which led to the biomass of 16-19 years old forests (81.15 thm-2) lower than that of the 1213 years.