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利用微电解法预处理难生化降解的印染废水，对影响微电解效率的因素进行了研究。结果表明：在印染废水的pH为4，作用时间为60min，铁炭的质量比为2：1时，微电解法对难生化降解的印染废水的色度、CODCr的去除率分别达到96％和65％，BOD5／CODCr的比值由0．19提高到0．42，预处理后的印染废水的可生化性能明显提高。“,”in this paper, a pretreatment of printing and.dyeing wastewater was applied by micro-electrolysis method. And it explored the influence factors on micro-electrolysis efficiency. It was found that at the pH of printing and dyeing wastewater 4, quality ratio of iron to charcoal 2 ＂ 1, and treating for 60 min, the removal rate of chromaticity and CODc, of the waste water can be up to 96% and 65%, respectively. And the ratio of BOD5/CODCr increased from 0.19 to 0.42. The biochemical degradation performance of treated printing and dyeing wastewater was increased greatly.