PM2.5　samples　were　collected　at　Tangshan　in　four　representative　sites　during　July　2012,　which　were　Tangshan　Industrial　Zone　(iron　and　steel　metallurgy　industry),　Fengnan(economic　development　zone),Tangshan　Monitoring　Center　(residential　and　commercial　mixed　area)　and　the　Tangshan　University　City　(cultural　and　educational　area).　PM2.5　characteristics　were　studied　through　the　analysis　of　elements　and　water　soluble　components,　and　the　source　of　PM2.5　was　analyzed　by　positive　matrix　factorization　(PMF).　The　results　showed　that　average　concentration　of　PM2.5　was　97　μg/m3.　The　concentration　order　was　as　follow:　Industrial　Zone　>　Economic　Development　Zone　>　University　City　>　residential　area.　Fe,Pb,　Mn　enrichment　factors　in　Industrial　Zone　and　Economic　Development　Zone　were　also　significantly　higher　than　other　regions.　University　City　was　influenced　by　the　surrounding　construction　activities,　and　the　concentration　of　Al　was　the　highest.　Secondary　inorganic　aerosols　accounted　for　47.7%　of　the　components　of　PM2.5.　The　fixed　source　and　mobile　source　contributions　were　also　different　according　to　different　sites.　High　temperature　and　humidity　were　good　for　generating　secondary　inorganic　aerosols;　SO2　conversion　rate　was　0.57,　and　NO2　conversion　rate　was　0.39.　The　major　sources　of　PM2.5　were　metal　metallurgical　industry,　unorganized　dust,　motor　vehicles,　cement,　ceramic　industry,　and　the　regional　transmission　also　contributed　to　PM2.5　pollution.