Abstract: Allometric regression equations for biomass prediction were developed for trees of Hevea brasiliensis in the Leizhou peninsular region of Southern China. Individual tree component dry weight,such as leaf, branch,bole,root, bark, total aboveground and underground,whole tree were regressed against girth(at breast height 1.3 m)and D2H(D diameter at breast height,H total height)using 49 sample trees. The statistical comparison showed that the regression equation against girth was better than that of against D2H. In 25-year-old rubber plantation,approximately 80% of tree biomass was in the aerial part and 20% in the roots. The bole,branches, roots and leaves constituted about 52.0%, 23.6%,19.7% and 4.7% of the whole tree biomass respectively.The revised biomass table using regression equation against girth was developed.