The impacts of anthropogenic heat emissions, urban land use, and aerosols on a snowfall event in Beijing were investigated by using the Weather Research and Forecasting model. The results show that urban land use and anthropogenic heat emissions can reduce the accumulation of snowfall by 17%–22% within the fifth ring road, which depends on the aerosol number concentration and size. The increase in aerosols (same land use and anthropogenic heat emissions) can increase the accumulated snowfall within fifth ring road, especially for accumulated and coarse mode. Urban land use, anthropogenic heat emissions, and aerosols have different effect on snowfall, which depend mainly on relatively humidity. Urban land use and anthropogenic heat emissions lead to the formation of an "urban heat and dry island," which is not favorable to snowfall processes during the initial snowfall processes and leads to a decrease in ice crystals and snow by 47% averaged. At this time, the increase in aerosol number concentrations has less impact (increase by 5% averaged) on snowfall because of higher supersaturation required for activation. With the development of snowfall processes, the feedback of cloud microphysics decrease temperature and increase relative humidity, which is favorable to snowfall process and increase snowfall slightly by 5% averaged. Meanwhile, the critical radius of aerosols that can be activated decrease, smaller particle aerosols are activated to form supercooled cloud water and further to form ice crystals and snow, which leads to an increase in accumulated snowfall by 11% averaged. Plain Language Summary: Urban are places where humans live, but human activities including urban land use changing, anthropogenic heat, and aerosols emissions can change local weather, especially local precipitation. It's important to know how human activities affect precipitation to avoid urban flooding and provide a theoretical basis for artificial impact weather. We analyzed the impact of urban land use, anthropogenic heat, and aerosols emissions on a snowfall over Beijing by using numerical simulation. Urban land use and anthropogenic heat emissions lead to the formation of the "urban heat and dry island," which leads to a decrease in the initial snowfall but slightly increase snowfall in the later period. The effect of aerosols on snowfall is related to number concentration and size. And the increase in aerosol number concentrations has less impact on snowfall at the initial period due to the lower supersaturation produced by the urban heat and dry island but increase snowfall in the later period due to higher supersaturation caused by the feedback of the cloud microphysics. Key Points: The interaction effects of urban environment, aerosol, large‐scale environment, and cloud microphysical processes reduce 16%–22% snowfallThe urban heat and dry island reduce 47% snowfall at the initial period and slightly increase 5% snowfall at the later periodThe increase of aerosols has the increase effects on snowfall, which increases about 5% and 11% at the different periods, respectively [ABSTRACT FROM AUTHOR]