A beam smoothing experiment of one beam of the 6-beams high power KrF laser system at CIAE has been demonstrated using the technigue of echelon-free induced spatial incoherence (EF-ISI). The focal profiles with 1.4% rms deviation from a flat top distribution through the laser system capable of producing 30-40 J per pulse in 50 ns at a target were obtained and the 50 ns pulse has been compressed to 25 ns by keeping the same energy per pulse using an optical gain-saturation switch mediod. The flyer acceleration experiments by a high-power smoothing beam KrF laser with a long pulse duration have been made. The flyer consists of Kapton film and Al foil, it is accelerated to the velocity of over 8 km/s by a powr density of 7×1011 W/cm2 driving flyer with a focal spot diameter of 300 μm using KrF laser irradiation. The 1-D hydrodynamics simulation shows that the peak pressure caused by the impact of flyer is over IMbar in the impacted Cu targer. In addition to above experiments the supershort laser amplification through electron pumped preamplifier and main-amplifier and the measurements of super-hot electron temperature for the supershort laser beam interactron with target by a 1800 electron magneto-spectrometer have been conducted.