Abstract: The electromigration of ~(153,154)Eu was studied with CAM as the supportingmaterial. The factors influencing the migration were investigated, including elec-tric field intensity, consentration and pH of the electrolyte, ionic strength andtemperature. The stability constant of EuR~(2+) complex and its electromobilitywere determined to be 1549 and 1.2×10~(-7)cm~2/s.V respectively under the followingconditions: α--HIBA = 0.4 M, μ = 0.01, Voltage = 1000V.