  We studied the one-loop contributions of the gaugino-Higgsino-sector to the
process of top-pair production via $\gamma \gamma$ fusion at NLC in frame of
the Minimal Supersymmetric Model(MSSM). We find that the corrections to $\gamma
\gamma \to t\bar{t}$ and $e^+ e^- \to \gamma \gamma \to t\bar{t}$ are found to
be significant and can approach to a few percent and one percent, respectively.
Furthermore, the dependences of the corrections on the supersymmetric
parameters are also investigated. The corrections are not sensitive to
$M_{SU(2)}$ (or $|\mu|$) when $M_{SU(2)}~>>~|\mu|$
  (or $|\mu|~>>~M_{SU(2)}$) and are weakly dependent on the $\tan{\beta}$ with
$M_Q$ (or $|\mu|$) being large enough. But they are sensitive to the c.m.s.
energy of the incoming photons.
