Although　much　research　is　being　conducted　on　the　characteristics　of　PM2.5　and　PM10　at　subway　stations,　there　is　no　research　focusing　on　a　complex　subway　transfer　station.　In　this　paper,　the　characteristics　of　PM2.5　and　PM10　at　transfer　stations　are　studied.　For　comparison,　monitoring　is　performed　under　different　outside　conditions　at　four　different　transfer　stations　in　the　non-peak　period　during　March　2018.　The　concentrations　of　PM2.5　and　PM10　on　the　platform　in　the　transfer　stations　is　approximately　10　mu　g/m(3)　lower　than　in　the　non-transfer　station,　when　outside　PM2.5　is　lower　than　150　mu　g/m(3)　However,　the　ratio　of　PM2.5　to　PM10　at　the　transfer　stations　(lowest　78.1%)　is　higher　than　at　the　non-transfer　station　(lowest　61.2%),　indicating　that　the　PM10　content　differs　from　the　non-transfer　station.　In　a　transfer　station　with　the　same　depth,　the　PM　concentration　is　the　same　or　similar.　In　addition,　the　concentration　of　PM2.5　at　subway　stations　has　a　strong　correlation　with　the　outside　environment　(R-2=0897),　which　indicates　that　an　outside　condition　is　important　for　the　subway　environment.