  Let $M^{2n}$ be a unitary torus $(2n)$-manifold, i.e., a $(2n)$-dimensional
oriented stable complex connected closed $T^n$-manifold having a nonempty fixed
set. In this paper we show that $M$ bounds equivariantly if and only if the
equivariant Chern numbers $< (c_1^{T^n})^i(c_2^{T^n})^j, [M]>=0$ for all $i,
j\in {\Bbb N}$, where $c_l^{T^n}$ denotes the $l$th equivariant Chern class of
$M$. As a consequence, we also show that if $M$ does not bound equivariantly
then the number of fixed points is at least $\lceil{n\over2}\rceil+1$.
