Abstract: In this paper the effects of the physiological and biochemicail response with low pH on Common Carp were analyzed.The Results showed that when common carps are in the Condition of low pH,the contents of blood K＋ was evidently higher than the normal level,the Contents of Na＋was evidently lover than the normal level.When pH is 4.5-5.0,the contents of plasma glucose was evidently high and body Weight Was weakened Swiftly.when PH was 4.5-6.0,with the Concentration rising,the activation of Na＋-K＋-ATPase in gill filament was weakened evidently and inhibited(p＜0.01),and the percent of being inhibited was 50%.when pH was 6.0,with aluminium added (0.5mg/mlAl3＋),the percent of being inhibited was 75%;pH was 4.0-5.5,the percent of being inhibited was 100%.

Key words: PH, Common Carp, Physiological, Biochemical, Toxicoloogical tests