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The dynamics of electron transport in single-layer MoS2 is simulated by employing the single particle Monte Carlo method.Acoustic phonon scattering,optical phonon scattering and FrShlich scattering are taken into account.It is found that the electron mobility decreases from 806cm2/V.s for a transverse electrical field of 103 V/m to 426/112cm2/V.s for a transverse electrical field of 105/107 V/m.F-urther detailed analysis on carrier dynamics reveals that the low field mobility is dominated by the acoustic phonon scattering while the role of optical phonon scattering is to relax the electron energy below the optical phonon energy by efficient energy relaxation through optical phonon emission.Only when the transverse electrical field is larger than 106 V/m,the mobility can be determined by the opticaJ phonon scattering,leading to a strong mobility degradation.