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To work a way out to detect the hydrazine contained in povidone K30 through UV and visible spectrophotometry.The hydrazine contained by povidone K30 sample acts on p-dimethylaminobenzaldehyde and generates p-dimethylamino benzylazine.The generation come into being yellow compounds quinone under acidic conditions, it has maximum absorption peak at 457 nm.Within the range of determination, the level of yellow color is in direct proportion to hydrazine content.Then the hydrazine content could be quantified according to this principle.Results: Repeated test one same sample, meanwhile 2 μg hydrazine was added into the sample to test recovery rate.The obtained recovery rate is between 96.0-97.5%, and relative standard deviation (RSD) is 3.7% (n = 6).Testing hydrazine contained by povidone K30 through UV and visible spectrophotometry is a precise, simple and feasible method.It has desirable recovery rate and good repeatability.

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