BESIII has the world’s largest samples of $J/\psi$ and $\psi(3686)$ events from
$e^+ e^-$annihilations, which offer an ideal and clean laboratory to study light meson
spectroscopy , in particular for the search for QCD exotics. Recent important
achievements in this field, including the observation of a 1-+ state, $\eta_1(1855)$ in
$J/\psi->\gamma \eta \eta’$, the observation of the $X(2600)$ in $J/\psi->\gamma \eta’ \pi^+\pi^-$,
and the PWA of $J/\psi->\gamma \eta’ \eta’$ will be highlighted.