针对介质pH值的变化对硫酸盐还原菌 (SRB)的影响 ,研究了在不同pH值介质中SRB的变异规律及变异菌对碳钢腐蚀的影响。结果表明 ,耐酸菌和耐碱菌的活性均比原始菌弱 ;变异菌及原始菌的腐蚀对比试验表明 ,耐碱菌对碳钢腐蚀最严重 ,其次是耐酸菌 ,两者均大于原始菌。 In view of the influence of media pH value on sulfate-reducing bacteria (SRB), the variation of SRB in different pH media and the effect of different bacteria on the corrosion of carbon steel were studied. The results showed that the activities of acid-fast and alkali-tolerant bacteria were weaker than those of the original ones. The comparative experiments on the corrosion of the mutants and the original bacteria showed that the alkali-resistant bacteria had the most serious corrosion on the carbon steel, followed by the acid-fast bacteria, both of them were more than the original bacteria.