  The $O(\alpha m_t^2/m_W^2)$ Yukawa corrections to top pair production in
photon-photon collision are calculated in the standard model (SM), the general
two-Higgs-doublet model (2HDM) as well as the minimal supersymmetric model
(MSSM). We found that the correction to the cross section can only reach a few
percent in the SM, but can be quite significant ($>$10\%) in the 2HDM and MSSM
for favorable parameter values, which may be observable at the high energy
$e^+e^-$ colliders.
