A microfluidic dielectrophoresis system includes: one supply device for a liquid medium having particles contained therein, N≧2 microfluidic, dielectrophoretically active channels, which are equipped with electrodes, lines for the fluidic connection of the supply device to the channels, for the connection of the channels to one another, and for the drainage of the medium and/or the particles from the channels, and valves for setting the flow direction of the medium in the lines, the dielectrophoretically active channels being situated and being connected by lines in such a way that they may be operated connected in parallel and in series by switching the valves in relation to the flow direction of the medium and the electrodes of the various channels are activatable independently of one another.