  In the framework of topcolor-assisted technicolor model we calculate the
contributions from the pseudo Goldstone bosons and new gauge bosons to $e^+e^-
\to t\bar{t}$. We find that, for reasonable ranges of the parameters, the
pseudo Goldstone bosons afford dominate contribution, the correction arising
from new gauge bosons is negligibly small, the maximum of the relative
corrections is -10% with the center-of-mass energy $\sqrt{s}=500$ GeV; whereas
in case of $\sqrt{s}=1500$ GeV, the relative corrections could be up to 16%.
Thus large new physics might be observable at the experiments of
next-generation linear colliders.
