Study of $eta$-meson Decays at KLOE/KLOE-2

Working at a $phi$-factory, KLOE/KLOE-2 has collected a very large and clean sample of $eta$ decays, which allow to perform a variety of precision measurements. This report presents the recent results on the $eta$-meson decays from KLOE/KLOE-2 experiments, including the search of the $C$-violating decay $etarightarrowgammagammagamma$, the determination of the $CP$ asymmetry in $etarightarrowpi^+pi^-e^+e^-$, the precision measurement of the $etarightarrowpi^+pi^-pi^0$ Dalitz plot distribution, the search for the $CP$-violating decay $etarightarrowpi^+pi^-$ and the precision measurement of ${cal O}(p^6)$ dominated decay $etarightarrowgammagammapi^0$.