Objective: To investigate the Inhibitory effects of Xiaochaihu Dectoction (XCHHD) and it's supplemented formule on bacterium. Methods : The agar diffusion test and tube broth method were used to examine the antibacteral effects of XCHHD and it's supplemented formule on β- hemolytic streptococcus , S. Pneumoniae, S. aureus, P. aeruginosa and E. coli. Results : The inhibition circle of XCHHD to pathogens above were( 12.05 ± 0.23 ) mm, ( 14.25 ± 0.23 ) mm, ( 13.20 ± 0.31 ) mm, ( 10.20 ±0.35 ) mm, ( 12.01 ± 0.46 ) mm respecti...