A method of miniaturized capillary electrophoresis with electrochemical detection has been developed for the determination of beta-adrenergic agonists in pig urine and pig fodder. Several important factors, including running buffer acidity, separation voltage, working electrode potential, etc., were evaluated to acquire optimum analysis conditions. Under the selected optimum conditions, these analytes can be well separated in 7 min. Good linear relationship was established between the peak current and the concentration of each analyte over 3 orders of magnitude. The detection limits ranged from 1.20 x 10(-7) to 2.06 x 10(-7) g/mL (S/N = 3). The proposed method has been successfully applied for the determination of beta-adrenergic agonist in pig urine and pig fodder with satisfactory results, providing a useful monitoring method for food safety.