Abstract: In order to understand growth dynamics and biomass accumulation of Flamingia macrophylla intercropped with rubber plantation of different ages, periodic observation of growth dynamics of Flamingia macrophylla was carried out in 4- year- old, 7- year- old and 16- year- old rubber- Flamingia macrophylla intercropped systems, Furthermore, by using the investigation data of 28 samples of Flamingia macrophylla with different basal diameter and height, the regression model of the biomass relating with BD2H was established and applied to estimate the biomass of Flamingia macrophylla intercropped with rubber plantation of three different ages. The results showed that mean basal diameter and mean height were 2.89 cm and 3.30 m after it was planted in 4-year-old rubber plantation for 2.5 years, which were 1.25 and 1.86 times, and 1.05 and 1.47 times as much as that of mean basal diameter and mean height in 7- year- old and 16- year- old rubber plantations, respectively. The biomass of Flamingia macrophylla was 28.356 t/hm² after it was planted in 4-year-old rubber plantation for 2.5 years, which was 2.55 and 6.37 times as much as that in in 7-year-old and 16- year- old rubber plantations. Concerning organ allocation of biomass of Flamingia macrophylla, the biomass of stem occupied the greatest proportion (50%-60%) of the total biomass, root biomass was ranked the second (23%- 32% ), leaf biomass was accounted for 11%- 16% , but fruit contributed the smallest (1.79%- 12.38% ) of the total biomass. The results indicated that the growth of basal diameter and height as well as biomass accumulation declined sharply with the rubber plantation age.