  In the framework of topcolor-assisted-technicolor model(TC2), we study a
flavor-changing neutral top-pion production process $\gamma\gamma\to
t\bar{c}\Pi_{t}^{0}$. The study shows that there exists a resonance effect
which can enhance the cross section up to a few fb even tens fb. For a yearly
luminosity 100 $fb^{-1}$ at future linear colliders, there might be hundreds
even thousands events to be produced. On the other hand, the background of such
flavor-changing process is very clean due to the GIM mechanism in SM . With
such sufficient events and clean background, neutral toppion could be detected
at future linear colliders with high center of energy and luminosity. Our study
provides a possible way to test TC2 model.
