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One in 58 strains of bacteria isolated from the compost showed clear colonies after a few days of growth on the platesrncontaining medium made of only agar and water. Water suspension contained only agar (2 and 8 g ? L-1) with two controls (normalrnsaline, LB medium) was inoculated with the bacterium BR5-1 to see whether there was an increasement of the alive bacteriarnconcentration after 48 h of the growth. The results showed that there was a signifi cant rising of the alive bacteria concentration inrnthe agar suspension (6.5×103 and 6.0×103 cfu ? mL-1) compared to that in the normal saline control (6.1×102 cfu ? mL-1), and it wasrnfar lower than that in LB (Luria-Bertani) control (1.1×108 cfu ? mL-1). In conclusion, the bacterium strain BR5-1 could degrade agar.