This is an analysis of the composition and structure of tree community of Bukit Badindiang sacred forest in Nagari Simpang, Pasaman, West Sumatera Province, Indonesia. The study aimed to: 1. to obtain a representative account of the structure and composition of tree community of the sacred forest; 2. to estimate the Aboveground Carbon Stock (c-Stock) accumulated on the tree community. A one-hectare plot was divided into 25 subplots of 20 x 20 m each for tree and debris data collection. In each

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... ubplots, there were a 5 x 5 m sapling subplots. Planting of 1 x 1 m seedling, understorey plant and litter subplots were nested inside. A total of 446 trees were recorded, representing 139 species from 49 families with a total basal area of 38.59 m2. The most dominant tree species was Campnospemza anriculata pmportance Value (IV) of 19.1 91. The other prevalent species were Ficus benjamina (IV ~1 6 . 5 0 ) and Mallotzls caudatus (IV ~14.78). A total of 62 species (44.6O/o) was considered locally rare with density of 1 tree/ha. Mallotzls candatus had the highest density (37 trees/ha) and Ficus benjamina had the highest Basal Area P A ) (5.61 m2 = 14.51% of the total). Euphorbiaceae (IV= 37.40) was the dominant family. The richest families were Euphorbiaceae (10) and Lauraceae (10). The total estimated Aboveground C-Stock was 190.62 MgC/ha, with the highest C was contributed by trees (178.85 MgC/ha or 93.8% of total). Trees with diameter class of 10 -69.99 cm stored 62% of total tree carbon. The species richness, tree density and C-Stock of Bakit Badindiang sacred forest were relatively higher than those in several disturbed lowland forests in Sumatera.