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An experiment on a transient nickel-like Mo x-ray laser in the extreme light III (XL III) laser facility is analyzed,based on the two-dimensional hydrodynamic evolutions of a plasma under a non-uniform incident laser.Influences of the pulse duration and intensity on plasma scale length,electron density,temperature,as well as their distributions are investigated,based on which the pre-puise character and delay time are determined according to the parameters of laser line focus on XLIII.It is found that the optimal intensity of the pre-pulse is 1.0 TW/cm2 with a duration of 5OOps;a well modified pre-plasma can be obtained after 1.6ns under low quality line focus in the lab.