A voltammetric sensor for the determination of acid orange Ⅱ（AO2） was developed based on molecularly imprinted electropolymerized membrane.The sensor was obtained by electropolymerization of o-phenylenediamine（o-PD） and m-dihydroxybenzene（m-DB） on a platinum electrode in the presence of AO2 as a template.The recognition performance of the sensor was studied in the presence of potassium ferricyanide（K3［Fe（CN）6］） by cyclic voltammetry（CV） and differential pulse voltammetry（DPV）.The template was removed by washing with methanol-acetic acid（7∶3） solution.The studies revealed that the imprinted sensor showed an excellent selectivity,sensitivity and stability for AO2.The response of the imprinted sensor was linear with concentration of AO2 from 1.0 μg/L to 100.0 μg/L,and the detection limit（S/N=3） was 0.10 μg/L.The method was applied in the detection of AO2 in drinks and beer samples with satisfactory results.