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A Ni-like Mo soft x-ray laser (SXRLs) operating at 18.9nm has been demonstrated by employing a grazing incidence pumping scheme with 120mJ in the 200ps pre-pulse and 140mJ in the 20Ors main pulse.The SXRL gain is estimated to be 1.5-3 cm-1 when a grazing incidence angle of 14° is applied.Numerical simulations axe also performed to investigate the dynamics of the ion distribution.It is found that a high intensity at 2.4×1014 W/cm2 of the 20Ors main pulse could heat the pre-plasma rapidly to an appropriate temperature for population inversion,and could compensate for the shortage of the total pump energy to a certain extent.