Effects of different concentration （0, 10, 20, 40, 60 and 80 g/mL） water extracts of Euca- lyptus citriodora Hook. f. leaves on root growth and some physiological indices of Vaccinium spp. seedlings were studied based on soil culture experiments. The results showed that the root activity of Vaccinium spp. increased first and then decreased with concentration of water extracts of E. citriodora leaves, and reached the peak with 20 g/mL. The root activity was significantly different but dry mass of root was insignificantly different between different concentration treatments. Low concentration （ ≤20 g/mL） water extracts significantly improved chlorophyll a, chlorophyll b and total chlorophyll of Vaccinium spp. leaves, but high concentration （ ≥ 60 g/mL） of water extracts significantly reduced those （ P 〈 0. 05 ）. High concentration （≥60 g/mL） water extracts of significantly improved relative conductivity rate and chlorophyll a/b of Vaccinium spp. leaves, but low concentration of water extracts had no significantly effect. These investigations indicated that Vaccinium spp. had a less sensitive and a certain tolerance to the water extracts of E. citriodora, but a significant inhibition of growth occurred with a higher concentration of water extracts.