Abstract: In this paper, the simulation and theoretical analysis of Nilike Ag Xraylaser (XRL) are included, which are driven by 1.06μm premainpulse with a power of 1.2×1013W/cm2. It is verified that, employing 23mm target, XRL can obtain effective amplification, which agrees with experiments. Power nonuniformity along focus line, induced by single cylindrical lens, is also considered. According to theoretical simulation, adopting curve target can effectively overcome the effect of reflection and the disadvantage of this nonuniformity. Lower limit of drive power needed by output of Nilike Ag XRL, predicted by theoretical simulation, also agrees with experiments. Theoretical simulation shows that, using 1% pre-pulse, if appropriate optimization of time interval between preand main puls