Abstract: The inhibitions of the biocontrol bacterium strain ANTI-8098A (Bacillus cereus) against Ralstonia solanacearum virulent strain F-01-V and avirulent strain F.1.3-010602-01-A were investigated and streptomycin was used as control. The results showed that the inhibition of strain ANTI-8098A against strain F-01-V was strong. There was a positive correlation between the inhibiting rate and the bacteria number of strain ANTI-8098A. The inhibition of strain ANTI-8098A against strain F.1.3-010602-01-A was weak. The inhibiting rates of the culture of strain ANTI-8098A with the bacteria number 20.0×108 cfu/ml against strain F-01-V and strain F.1.3-010602-01-A were 99.5% and 14.7%, respectively. Streptomycin could inhibit the growth of strains F-01-V and F.1.3-010602-01-A. There was a positive correlation between the inhibiting rate and the concentration of streptomycin. But the inhibition of streptomycin against strain F.1.3-010602-01-A was greater than the inhibition against strain F-01-V. The inhibiting rates of streptomycin with the concentration of 0.25 U/ml against strain F-01-V and strain F.1.3-010602-01-A were 3.3% and 50.0%, respectively. The field experiment on controlling the bacterial wilt disease of eggplant indicated that the strain ANTI-8098 reduced eggplant wilt severity by 92.11%, which was significantly higher than that with 72.81% using streptomycin. The results provided evidences for explaining the attenuation of strain ANTI-8098A against R. solanacearum.