In this study PlASIMO was used to investigate the effect of current on energy exchanging in argon plasmas produced in the cascaded arc,the currents of 30,50,70,90 A were chosen.The simulation results show that from the inlet to the outlet along the symmetry axis,the ohmic dissipation density decreases.With increasing current,the ohmic dissipation density increases.The energy exchanging is contributed by elastic collisions near the inlet.However the energy transferring by inelastic collisions increases and then decreases.With increasing current,the energy transferring by inelastic collisions increases and reaches the maximum at the outlet.