  In the paper under study, we consider the following coupled non-degenerate
Kirchhoff system \begin{equation}\label{P} \left \{ \begin{aligned}
&\displaystyle y_{tt}-\upvarphi\Big(\int_\Omega | \nabla y |^2\,dx\Big)\Delta y
+\upalpha \Delta \uptheta=0, &\mbox{ in }&\; \Omega \times (0, +\infty)\\
&\displaystyle \uptheta_t-\Delta \uptheta-\upbeta \Delta y_t =0, &\mbox{ in
}&\; \Omega \times (0, +\infty)\\ &\displaystyle y=\uptheta=0,\; &\mbox{ on
}&\;\partial\Omega\times(0, +\infty)\\ %&\displaystyle y=0,\; &\mbox{ on
}&\;\partial\Omega\times(0, +\infty)\\ %&\displaystyle \partial_\nu y=0,
&\mbox{ on }&\;\Gamma_1\times(0, +\infty)\\ &\displaystyle y(\cdot, 0)=y_0, \;
y_t(\cdot, 0)=y_1,\;\uptheta(\cdot, 0)=\uptheta_0, \; \; &\mbox{ in }&\;
\Omega\\ \end{aligned} \right. \end{equation} where $\Omega$ is a bounded open
subset of $\mathbb{R}^n$, $\upalpha$ and $\upbeta$ be two nonzero real numbers
with the same sign and $\upvarphi$ is given by $\upvarphi(s)=
\mathfrak{m}_0+\mathfrak{m}_1s$ with some positive constants $\mathfrak{m}_0$
and $\mathfrak{m}_1$.
  So we prove existence of solution and establish its exponential decay. The
method used is based on multiplier technique and some integral inequalities due
to Haraux and Komornik\cite{H1,KOM}.
