测定了草鱼鱼种对复合酚的耐受性以及利用Ｋ－ Ｂ法在体外测定了复合酚对荧光假单胞菌和肠型点状气单胞菌的抑菌作用。结果表明， ２４， ４８， ７２ ， ９６ ｈ 的ＬＣ５０ 分别为１９－３６ ×１０－６ ， １８－３７ ×１０ －６， １７－５２ ×１０－６ ，１５－８１ ×１０ －６μＬ／Ｌ， 安全浓度为４－９６×１０－６μＬ／Ｌ。复合酚对荧光假单胞菌的抑菌作用明显， 最小抑菌浓度（ＭＩＣ）小于１２－５×１０－６ μＬ／Ｌ； 对肠型点状气单胞菌的抑菌效果不明显。 The tolerance of grass carp fingerlings to complex phenols was measured and the bacteriostasis of complex phenols against Pseudomonas fluorescens and Enterobacter pneumatosis was determined by K-B method in vitro. The results showed that the LC50 of 24, 48, 72 and 96 h were 19-36 × 10-6, 18-37 × 10-6, 17-52 × 10-6, 15-81 × 10-6 μL / L, respectively The concentration is 4-96 × 10-6 μL / L. The inhibitory effect of complex phenol on Pseudomonas fluorescens was obvious with the minimum inhibitory concentration (MIC) of less than 12-5 × 10-6 μL / L. The antibacterial activity against Aeromonas enteritidis was not obvious.