In　2013,　field　measurements　of　indoor　environments　in　children＇s　(from　8　to　12　years　old)　dwellings　were　performed　in　20　households　in　Dalian　and　Beijing　to　investigate　the　association　between　indoor　environmental　factors　and　children＇s　health.　This　study　includes　comprehensive　factors　about　indoor　environment　in　children＇s　dwellings　in　Dalian　and　Beijing　and　the　exposure　levels　of　multiple　pollutants.　The　results　showed　that　the　indoor　thermal　environments　were　similar　in　Dalian　and　Bejing.　Regarding　children＇s　indoor　air　quality,　indoor　PM2.5　in　Beijing　was　more　serious　than　that　in　Dalian.　Dwellings　in　Dalian　have　more　chemical　pollutants　than　those　in　Beijing.　In　addition,　Penicillium,　Cladosporium,　and　Aspergillus　were　found　as　the　main　fungi　in　children＇s　dwellings.　Moverover,　indoor　thermal　comfort　in　healthy　children＇s　dwellings　was　better　than　in　unhealthy　children＇s.　The　indoor　PM2.5　from　indoor　sources　may　affect　children＇s　health　with　regard　to　respiratory　diseases　and　allergies　more　than　those　from　outdoor　sources.　When　the　concentration　of　formaldehyde　got　higher,　the　relationship　between　formaldehyde　and　children＇s　health　was　more　significant.　The　other　factors　were　not　found　to　have　a　significant　relation　with　children＇s　health.