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The carbon storage of different age Eucalyptus urophylla plantation were studied in Western Pearl River Basin, and analyzed the relation between forestry management with the its distribution patterns of tree layer, litterfall and the understory, and the economic value of the carbon sequestration were also examined,The results shows that (1) In different soil layer ,with the increase of soil depth, Soil organic carbon density decreased, but there was significant difference of Soil organic carbon density between 1 year stand and 3 year stand though the highest is in older stand, that were 69.84 t hm-2,40.18 t hm-2 in 0-25cm layer 25-50cm layer respectively and the lowest is in younger stand, that were 68.69 t hm-2 ,40.85 t hm-2 in 0-25cm layer 25-50cm layer respectively , (2)the carbon storage different from the stand age ,the 1 year stand was 108.33 t hm-2, 3 year stand was 131.71 t hm-2,but the range order was little difference in different layer, soil layer occupied the highest, and soil layer( 95.94 t hm-2，89.39%）> litterfall（4.52 t hm-2，4.21%）>tree layer（3.84 t hm-2，3.58%）> understory,（3.03 t hm-2，2.82%） in 1 year stand, and soil layer（99.28 t hm-2，77.13%）>tree layer（23.38 t hm-2，18.16%）> litterfall（3.62 t hm-2，2.81%）>understory（2.43 t hm-2，1.89%）in 3 year stand.(3)the economic value of carbon sequestration amounts to RMB 45 728.26 yuan, and the economic benefit of fixation carbon dioxide is RMB 167 670.28 yuan hm-2 in the 1 year stand, and the 3 year stand was RMB 55 597.43 yuan, RMB203 857.22 yuan hm-2
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