Indoor　fungi,　as　an　important　group　of　biological　contaminants,　are　recognized　as　risk　factors　for　human　health.　However,　limited　data　are　currently　available　on　fungal　pollution　in　houses　of　China.　In　this　study,　fungi　in　air,　in　settled　dust　and　on　surfaces　in　urban　houses　with　children　are　determined　in　six　major　cities　of　China.　Aspergillus　spp.,　Penicillium　spp.　and　Cladosporium　spp.　are　the　most　frequent　genera　and　are　the　dominant　genera　in　air.　The　concentrations　of　these　three　fungi　account　for　an　average　percentage　of　87%　and　83%　of　the　total　concentration　of　airborne　fungi　in　winter　and　summer.　Unlike　airborne　fungi,　there　is　no　particularly　obvious　dominant　fungal　genus　in　settled　dusts　and　on　interior　surfaces.　The　average　concentration　of　total　airborne　fungi　in　houses　in　summer　is　significantly　higher　(p　＜　0.001)　than　that　in　winter.　In　terms　of　total　concentration　of　airborne　fungi,　indoor　sources　significantly　contribute　to　indoor　airborne　fungi　in　winter,　whereas　the　contribution　of　outdoor　sources　is　relatively　greater　in　summer.　Average　concentration　of　airborne　fungi　in　northern　houses　is　higher　than　that　in　southern　houses　in　both　summer　and　winter.　Fungal　concentrations　in　air,　in　settled　dust　and　on　interior　surface　do　not　show　a　strong　relationship　(r　＜　0.5),　thus　air,　dust　and　surface　sampling　may　be　all　essential　to　evaluate　indoor　fungal　exposure.　The　findings　of　this　study　are　favorable　for　understanding　fungal　exposure　in　houses　and　can　provide　bases　for　establishing　control　strategies　for　indoor　fungi　in　China.