In the first phase of EASM when the rain band is over South China, aerosols cool surface by scattering solar radiation. The cooling effect decreases the land-sea temperature difference, and thus weakens the strength of the monsoon circulation, causing a pattern of precipitation change resembling southern flood and northern drought. The precipitation changes are mainly resulted from the aerosol radiative effect while the aerosol microphysical effect acts in the opposite way with a smaller magnitude. In the second phase of EASM, the rain band shifts to the Yangtze River Basin and Northeast China. Aerosols absorb solar radiation and warm the atmosphere. In the meantime, aerosols serve as cloud condensation nuclei and delay rain formation by producing smaller cloud particles. Both the aerosol radiative and microphysical effects contribute to the northward shift of clouds and precipitation by inducing a pattern of precipitation change as southern drought and northern flood. Moisture budget analysis shows the change of precipitation in both phases of EASM is mainly contributed by the changes in vertical velocity associated with convection, while the horizontal advection of moisture plays a non-negligible role.