  In this paper, we study the best constant of the following discrete
Hardy-Littlewood-Sobolev inequality, \begin{equation} \sum_{i,j,i\neq
j}\frac{f_{i}g_{j}}{\mid i-j\mid^{n-\alpha}}\leq C_{r,s,\alpha} |f|_{l^r}
|g|_{l^s}, \end{equation}where $i,j\in \mathbb Z^n$, $r,s>1$, $0<\alpha<n$, and
$\frac 1r+\frac 1s+\frac {n-\alpha}n\geq 2$. Indeed, we can prove that the best
constant is attainable in the supercritical case $\frac 1r+\frac 1s+\frac
{n-\alpha}n> 2$.
