  In the context of topcolor-assisted technicolor (TC2) models, we examine the
flavor changing (FC) Z decay $Z\to b\bar{s}(\bar{b}s)$ and calculate the
contributions of the new particles predicted by TC2 models to the branching
ratio Br($Z\to b\bar{s}+\bar{b}s$). We find that the contributions mainly come
from the top-pions. In most of the parameter space, the Br($Z\to
b\bar{s}+\bar{b}s$) can reach $10^{-5}$, which may be detected in near future
experiments such as Giga-Z version of the TESLA. Thus, the FC Z decay $Z\to
b\bar{s}(\bar{b}s)$ can be used to test TC2 models.
