The monthly dynamical extended-range forecasts are produced by the BCC_AGCM2.2 model, which is the second generation operational atmospheric model developed by Beijing Climate Center (BCC). The BCC-AGCM2.0.1 model is a spectral model with the horizontal T106 truncation and 26 vertical levels. The model is developed based on the NCAR CAM3, and it has been adjusted with specific referenced atmosphere and surface pressure. Some major adjustments in physical parameterizations are as follows. The introduction of the mass flux cumulus parameterization scheme of Zhang, GJ (2005) and with a further adjustment; the introduction of Yan Hong (1987) in the whole level potential temperature balance dry adiabatic adjustment programs; Wu, TW and Wu GX (2004) proposed the snow area coverage parameterization scheme; Considering the impacts of ocean waves, the ocean surface sensible heat and latent heat flux parameterization schemes have been adjusted. When the BCC_AGCM2.2 model is carried out in monthly dynamical extended range forecast, NCEP reanalysis data is applied as the atmospheric initial field, sea surface temperature initial field is the OISST data, and sea surface temperature anomaly is kept as constant during the forecast period.