To　study　the　characteristics　and　sources　of　PM2.5　and　its　carbonaceous　components　in　typical　cities　of　Beijing-Tianjin-Hebei　region,　PM2.5　sampling　was　conducted　in　five　sites　of　Beijing　and　Tangshan　from　July　3rd　to　30th,　2012.　Concentrations　and　variation　characteristics　of　PM2.5,　OC　and　EC　were　analyzed.　The　OC/EC　minimum　ratio　method　was　used　to　estimate　the　concentration　of　SOC,　and　the　factor　analysis　method　was　used　to　analyze　the　source　apportionment　of　carbonaceous　materials.　Results　showed　that　the　concentration　of　PM2.5,　OC　and　EC　in　Beijing　was　76.2±38.5　μg/m3,　7.0±2.2　μg/m3,　and　3.0±1.4　μg/m3,　respectively,　which　was　lower　than　the　corresponding　concentration　of　97.7±38.8　μg/m3,　11.7±6.3　μg/m3,　and　7.0±5.0　μg/m3,　in　Tangshan,　respectively.　The　concentration　of　PM2.5,　OC　and　EC　in　haze　weather　was　2.0,　1.2　and　1.8　times　of　that　in　non-haze　weather　in　Beijing　and　1.4,　1.5,　and　1.6　times　of　that　in　Tangshan.　The　concentration　of　SOC　was　3.0　μg/m3　and　5.1　μg/m3,　accounting　for　42.9%　and　43.6%　of　the　total　OC　concentration　in　Beijing　and　Tangshan,　respectively.　The　two　main　sources　of　carbonaceous　aerosols　in　PM2.5　were　coal　combustion　and　vehicle　exhaust.　The　joint　contributions　of　the　two　sources　were　both　larger　than　75%　in　Beijing　and　Tangshan.　Therefore,　effective　emission　mitigation　measures　for　the　above　two　sources,　such　as　clean　energy　substitution,　vehicle　population　growth　control　and　fuel　quality　improvement　are　needed.　©,　2015,　Beijing　University　of　Technology.　All　right　reserved.