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We study the radial and vertical oscillations in the three-dimensionalmagnetohydrodynamic (MHD) accretion flows around black holes. Generalrelativistic effects are taken into account by using pseudo-Newtonianpotential. We find that the structure of MHD flows is changed at $3.8 r_{\rms}\leq r\leq 6.3 r_{\rm s}$ and the two pairs of quasi-periodic oscillations(twin QPOs) are excited in that region. The time evolution of the powerspectrum density (PSD) indicates that these twin QPOs are most likely to beproduced by the resonance between the Keplerian frequency $\nu_{\rm K}$ and theepicyclic frequency $\nu_{\kappa}$. The PSD shows that the lower peak frequency$\nu_{\rm l}$ corresponds to $\nu_{\rm K}$, while the upper peak frequency$\nu_{\rm u}$ corresponds to $\nu_{\rm K} + \nu_{\kappa}$. The ratio of twopeak frequencies is close to 2:3. The results provide the first direct evidencefor the excitation of the resonant disk oscillation in the MHD accretion flows.Comment: 7 pages, 3 figures, accepted in PAS

2:3 Twin Quasi-Periodic Oscillations in Magnetohydrodynamic Accretion Flows