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The method of simultaneous analysis of three illegal veterinary (metronidazole,chloramphenicol and furazolidone)residues in aquatic product was developed with an ultra performance liquid chromatography using ultraviolet-visible detector.The mobile phase consisted of acetonitrile-0.004%phosphoric acid(pH=3.0),with a gradient elution and wavelengths procedure,at a flow rate of 0.3 mL/min.