  The observed Higgs boson mass and the naturalness argument leave us a narrow
window for the soft mass spectrum in natural supersymmetry that can be studied
through the electroweak precision tests (EWPTs). We divide the analysis into
the Higgs sector constrained by the charged Higgs mass bound, the
neutralino-chargino sector constrained by the chargino mass bound, and the
third-generation squark sector tightly constrained by the observed Higgs mass.
Total contributions to EWPTs in the MSSM and NMSSM are both presented. It turns
out that natural MSSM is excluded at 68\% CL but consistent at 95\% CL, whereas
natural NMSSM with nearly degenerate conditions is excluded at 68\% CL but
consistent at 99\% CL for $\lambda\leq 0.6$.
