Aromatic amines have toxicity and latent carcinogen.They often exist in dyestuff, pesticide, food additive and industrial wastewater, and belong to environmental contamination.It is important for their detection.The common methods are gas chromatography and high performance liquid chromatography.In order to obtain high column efficiency and fast separation, a sort of new technique, capillary electrochromatography (CEC) method can be used to detect them.