Atmospheric　precipitation　samples　were　collected　in　a　representative　region　of　Beijing　in　summer　of　2015　to　investigate　the　physical　and　chemical　characteristics　of　atmospheric　precipitation,　the　changes　and　causes　of　major　chemical　components　in　rainwater　during　the　course　of　typical　precipitation,　and　the　impacts　of　typical　precipitation　processes　on　atmospheric　pollutants.　The　volume-weighted　mean　pH　value　of　rainwater　in　the　representative　region　of　Beijing　in　summer　was　6.21　with　the　range　of　5.15-7.34,　and　acid　rain　seldom　occurred.　The　pollution　elements　Cd,　Ca　and　Mn　were　moderately　enriched,　and　Cu,　Zn,　Pb　and　S　were　seriously　enriched　in　rainwater,　of　which　Ca　and　S　were　main　pollution　elements,　which　accounted　for　45.43%　and　43.93%　of　the　total　pollution　elements　respectively,　and　Zn,　Mn,　Cu,　Pb　and　Cd　were　main　heavy　metal　pollution　elements,　which　accounted　for　1.32%　of　the　total　pollution　elements.　Different　rates　of　precipitations　could　have　different　impacts　on　atmospheric　pollutants.　PM2.5　could　be　scavenged　by　raindrop,　and　SO2,　NO2　and　O3　could　be　scavenged　greatly　by　raindrop　during　the　precipitation　episode　at　a　relatively　high　rainfall　rate,　containing　four　significant　stages,　such　as　clear-out　of　atmospheric　pollutants,　accumulation,　both　accumulation　and　clear-out,　and　another　clear-out　of　airborne　pollutants.　Atmospheric　pollutants　such　as　PM2.5,　SO2,　NO2　and　O3　could　mainly　be　scavenged　by　in-cloud　scavenging　processes　during　the　precipitation　episode　at　a　relatively　low　rainfall　rate,　including　four　important　stages,　such　as　clear-out,　both　clear-out　and　accumulation,　accumulation,　and　another　clear-out　of　atmospheric　pollutants.　The　effect　of　rainfall　at　a　relatively　high　rate　on　atmospheric　pollutants　was　bigger　than　that　of　rainfall　at　a　relatively　low　rate.　©　2017,　Science　Press.　All　right　reserved.