  We, for the first time, prove a compact version of $T1$ theorem for singular
integrals of Zygmund type on $\mathbb{R}^3$. That is, if a singular integral
operator $T$ associated with Zygmund dilations admits the compact full and
partial kernel representations, and satisfies the weak compactness property and
the cancellation condition, then $T$ can be extended to a compact operator on
$L^p(\mathbb{R}^3)$ for all $p \in (1, \infty)$. Let $\theta \in (0, 1]$ be the
kernel parameter, and let $A_{p, \mathcal{R}}$ and $A_{p, \mathcal{Z}}$
respectively denote the class of of strong $A_p$ weights and the class of $A_p$
weights adapted to Zygmund dilations. Under the same assumptions as above, we
establish more general results: if $\theta \in (0, 1)$, $T$ is compact on
$L^p(w)$ for all $p \in (1, \infty)$ and $w \in A_{p, \mathcal{R}}$; if
$\theta=1$, $T$ is compact on $L^p(w)$ for all $p \in (1, \infty)$ and $w \in
A_{p, \mathcal{Z}}$.
