A new method of separation of carcinogenic aromatic amines in wastewater is given.With the lower pH value (pH ≤ 2.0),it is effective to restrain the electroosmotic flow (EOF).At the same time,the migration time of the electroosmotic flow is more than 110 min,and the migration time of aromatic amines is less than 15 min.As a result,a capillary zone electrophoresis (CZE) system of lower electroosmotic flow was established.