Abstract: Based on the one-dimensional elastic-plastic reactive hydrodynamic code SSS, the one-dimensional magneto-hydynamics code SSS/MHD is developed successfully, which couples magneto-hydynamics calculation with centralized parameter circuit equations of simulative pulsed power source directly, and numerically simulates mechanical and electromagnetic kinetic processes and some kinds of parameter sections of samples according to original datum independent of real time experience circuit. The code SSS/MHD can simulate different thickness parallel configurations (sidestep target) with multi-medium and multi-cavities in magnetically driven isentropic compression experiments. The calculation of sidestep targets on aluminum, tantalum and plastic binder explosive in ICE experiments is described in this paper, and the velocity histories of samples free surface or optics window interface accord with experiment results tested by laser interference. It is important for magneto-hydrodynamics calculation to analyze the test results and improve the design. The purpose of this paper is to provide a simulation means with a certain extent prophecy and more perfect function for correcting and designing magnetically driven system and improving experiment configuration.