Description
The BESIII experiment has collected 2.6 billion of $\Psi(3686)$ events, 10 billion of $J/\Psi$
events, 20 $fb^-1$ of D meson pairs at 3.773 GeV, and 7.33 $fb^-1$ $D_sD_s^*$ events from 4.128
to 4.226 GeV. The huge data samples allow us to search for rare processes in charm
hadron decays. In this talk, we report the search for FCNC decay in $D_s^+\to h(h')e^+e^-$,
lepton number violation process $D_s^+\to h^-h^0e^+e^+$ and $\phi\to \pi^+\pi^+e^-e^-$, and lepton flavor
violation process $J/\Psi\to e \mu$ and $J/\Psi \to e \tau$. The search for $J/\Psi$ weak decays
containing D meson, $J/\Psi\to D^0\mu^+\mu^-$ and $J/\Psi \to γD^0$ will also be presented.
