Household　dust　is　an　important　source　of　premature　exposure　to　polybrominated　diphenyl　ethers　(PBDEs),　especially　for　children.　In　this　onsite　study,　246　dust　samples　were　collected　from　224　households　in　nine　Chinese　cities　during　2018-2019.　Questionnaires　were　administered　to　explore　the　association　between　household-related　information　and　PBDEs　in　household　dust.　The　median　concentration　of　sigma　12PBDEs　in　household　dust　from　9　cities　was　138　ng/g　(94-227　ng/g),　with　the　arithmetic　mean　of　240　+/-　401　ng/g.　Among　the　nine　cities,　the　highest　median　concentration　of　sigma　12PBDEs　in　household　dust　was　found　in　Mianyang　(295.57　ng/g),　while　the　lowest　was　found　in　Wuxi　(23.15　ng/　g).　BDE-71　was　the　most　dominant　congener,　ranging　from　42.08　%　to　98.15　%　of　the　12　PBDE　congeners　among　9　cit-ies.　Three　potential　sources　for　the　indoor　environment　were　Penta-BDE,　Octa-BDE　commercial　products,　and　photo-lytic　bromine　from　Deca-BDEs　based　on　the　largest　contribution　(81.24　%).　Under　the　moderate　exposure　scenario,　the　exposure　levels　through　ingestion　and　dermal　absorption　for　children　were　7.30　x　10-1　ng/kg　BW/day　and　3.26　x　10-2　ng/kg　BW/day,　respectively.　Temperature,　CO2,　years　of　residence,　income,　family　size,　household　size,　use　of　computers,　heating,　use　of　insecticide,　and　use　of　humidifiers　were　influential　factors　for　PBDE　concentra-tions　in　household　dust.　Based　on　the　evidence　of　the　correlation　between　PBDEs　and　these　household　parameters,　it　can　be　applied　to　reduce　PBDE　concentrations　in　household　dust,　which　is　a　basis　for　controlling　PBDEs　pollution　in　Chinese　households　and　protecting　population　health.