CP violation in charm decays at Belle

We have searched for CP violation of charmed mesons in the decays $D\to K^0_S P$,where$D$denotes$D^0$and$D^+_{(s)}$,and$P$ denotes the pseudo-scalar mesons ${\pi }^{+}$, $K^{+}$, ${\pi }^0$, $\eta$, and ${\eta }^{\mathrm{\prime }}$. No evidence of CP violation in these decays is observed. We also have measured the CP asymmetry difference between the Cabibbo suppressed decay $D^{+}\to \varphi {\pi }^{+}$ and the Cabibbo favored $D_s^{+}\to \varphi {\pi }^{+}$ decays in the region of $\mathrm{\mid }M(K^{+}{K}^{-})-M_{PDG}^{\varphi }\mathrm{\mid }<$16 MeV/$c^2$. The measured asymmetry is corrected for the residual asymmetry due to detector effects, and the contributions of both CP and forward-backward asymmetries are determined. These results are obtained on a large data sample collected at and near the $\mathrm{{\rm Y}}(4S)$ resonance with the Belle detector operating at the KEKB asymmetric-energy $e^{+}{e}^{-}$ collider.