  In the framework of topcolor-assisted technicolor (TC2) theory, we calculate
the contributions of the scalars(the neutral top-pion $\pi_{t}^{0}$ and the
top-Higgs $h_{t}^{0}$) to the flavor-changing rare top decays $t\to c V V$(V=
W, g, $\gamma$ or Z). Our results show that $h_{t}^{0}$ can enhance the
standard model $B_{r}^{SM}(t\longrightarrow cWW)$ by several orders of
magnitude for most of the parameter space. The peak of the branching ratio
resonance emerges when the top-Higgs mass is between $2m_{W}$ and $m_{t}$. The
branching ratio $ B_{r}(t\to c W W)$ can reach $ 10^{-3}$ in the narrow range.
