Abstract: This paper describes the principle of plasma electrooptical switch driving system. The system use plasma electrooptical switch system in high power ICF drivers based on large aperture size (for example, 300mm×300mm) multipass amplifier array scheme. The systems can product strict sequential correlated five highvoltage strongcurrent pulses. These pulses are loaded on longitudinal Pockels cell full of inert gas through three coaxial cables. As the electrooptical switch with plasma electrodes has unique advantage of high efficient, fast for on/off, high precision, large aperture size and high laser damage threshold, it has become an ideal switch system in new generation of ultrahigh power laser system.