  For $J/\Psi\to\bar pp \pi^0$ and $\bar pp\pi^+\pi^-$, the $\pi^0p$ and
$p\pi^+\pi^-$ systems are limited to be pure isospin 1/2 due to isospin
conservation. This is a big advantage in studying $N^*$ resonances from
$J/\Psi$ decays, compared with $\pi N$ and $\gamma N$ experiments. The process
$J/\Psi\to\bar pN^*$ or $p\bar N^*$ provides a new way to probe the internal
structure of the $N^*$ resonances. Here we report a quark model calculation for
$J/\Psi\to\bar pp$, $pN^*(1440)$ and $\bar N^*N^*$. The implication for the
internal structure of $N^*(1440)$ is discussed.
