Abstract: Electromigration technology has a wide application in the field of nuclide migration research, which is attributed to its advantage on obtaining nuclide migration parameters fast and accurately. In a traditional electromigration experiment, the ions are forced to the electrode of opposite charge rapidly in a constant electric field, and through the processes of soil cutting, nuclide concentration determination and model fitting, the migration parameters such as molecular diffusion coefficient and dispersity can be got. At present, this method is successfully applied in the migration behavior study of single-species nuclides, but for multiple-species ones it is not applicable. In this paper, a set of centimeter-scale outflow electromigration device was set up and used to carry out the research on the migration behavior of ⁸⁸Sr in Kerjian bentonite, meanwhile a complete set of method for data processing and parameter calculation was established. The outflow method in electromigration study is proved to be feasible, which lays the theory foundation of the research on multiple-species nuclides migration behavior in the future.