This paper makes it clear the character of houses which atopic dermatitis patients living in, through analizing the multiple dwelling house plan has many mites and house dusts. The conclusions are follows:
1. There is a correlation between gravity of house dust and number of mite.
2. There are many mites in the room using footcloth on any floor.
3. There are capabilities of many mites living in the room with many mite living in another.
4. Kitchen has small number of mite, living room and bed room have large number of mite.
5. It is arduous to breeze from south to north in the room many mites living in.
