The numericalsimulations of the model of double aluminum foils driven by high power laser beams arepresented. The state of flyer and the character of shock wave of target are depicted indetail, and the effects of several parameters on the state of flyer and the character ofshock wave of target are analyzed. The analyses of the simulated results showed that witha good matching between the target and laser, with a properly choicing the thickness ofthree-step target, the absolute measurement of equation of state may be approach.