An adiabatic bin-sized cloud parcel model is developed by incorporating the multi-chemicalcomponent(MCC) aerosol effects into the UWyo single-chemical-component (SCC) parcel model.The effects of aerosols mixing state on the warm cloud microphysics in North China are investigated by using the model based on the data of ion component analysis of ground aerosol grade sampling and the aerosol and cloud microphysics observation in high latitude in North China in spring 2006.It is found that in North China the aerosol internal mixing increases the CCN number concentration and the cloud droplet number concentration(CDNC) and decreases the maximum saturation ratio of water vapor in air parcel.It is also shown that the different aerosols mixing states in North China can affect the cloud droplet spectra (CDS) characteristics especially the CDS's average size and the peak value prominence degree; the relative dispersion value of CDS is near 0.3, and it decreases with increasing CDNC.It is indicated that aerosol mixing state can influence the microphysics of warm clouds, and thus affects atmospheric radiation and precipitation.This should attract more attentions in weather and climate change research in the future.