Many　studies　have　been　conducted　focusing　on　the　contribution　of　land　emission　sources　to　PM2.5　in　China;　however,　little　attention　had　been　paid　to　other　contributions,　especially　the　secondary　contributions　from　shipping　emissions　to　atmospheric　PM2.5.　In　this　study,　a　combined　source　apportionment　approach,　including　principle　component　analysis　(PCA)　and　WRF-CMAQ　simulation,　was　applied　to　identify　both　primary　and　secondary　contributions　from　ships　to　atmospheric　PM2.5.　An　intensive　PM2.5　observation　was　conducted　from　April　2014　to　January　2015　in　Qinhuangdao,　which　was　close　to　the　largest　energy　output　port　of　China.　The　chemical　components　analysis　results　showed　that　the　primary　component　was　the　major　contributor　to　PM2.5,　with　proportions　of　483%,　48.9%,　55.1%　and　55.4%　in　spring,　summer,　autumn　and　winter,　respectively.　The　secondary　component　contributed　higher　fractions　in　summer　(48.2%)　and　winter　(36.8%),　but　had　lower　percentages　in　spring　(30.1%)　and　autumn　(32.7%).　The　hybrid　source　apportionment　results　indicated　that　the　secondary　contribution　(SC)　of　shipping　emissions　to　PM2.5　could　not　be　ignored.　The　annual　average　SC　was　2.7%,　which　was　comparable　to　the　primary　contribution　(2.9%).　The　SC　was　higher　in　summer　(5.3%),　but　lower　in　winter　(1.1%).　The　primary　contributions　to　atmospheric　PM2.5　were　3.0%,　2.5%,　3.4%　and　2.7%　in　spring,　summer,　autumn　and　winter,　respectively.　As　for　the　detailed　chemical　components,　the　contributions　of　shipping　emissions　were　23%,　0.5%,　0.1%,　1.0%,　1.7%　and　0.1%　to　elements　&　sea　salt,　primary　organic　aerosol　(POA),　element　carbon　(EC),　nitrate,　sulfate　and　secondary　organic　carbon　(SOA),　respectively.　The　results　of　this　study　will　further　the　understanding　of　the　implications　of　shipping　emissions　in　PM2.5　pollution.　(C)　2017　Elsevier　Ltd.　All　rights　reserved.