The purpose of this study is to provide a basic for a desirable bathroom plan of apartments. As a first step in this process, we analyzed the bathroom plans of the apartments(area: 10-69 pyung) constructed in 8 sections in Seoul from 1971 to 1995 where 65,801 households live. In this study, the numbers, location, size, and proportion of the bathroom and dressing room, and the direction of the bathroom door in apartments are examined. The major frindings are as follows; 1) We have found that the numbers of bathrooms to increase in more than 20s pyung apartment since 1990. 2) Except a master bathroom, the another one for the guest is located in enterance in more than 40s pyung apartment. 3) The door of the bathroom faces corridor in more than 40s pyung apartment. So, it is possible for them to lessen discomfortness when they coming in and out of the bathroom. 4) It was found that the size of bathroom were decreased in most cases. 5) They did not plan a dressing room in 10s pyung - 60s pyung and the size of dressing room was decreased in 60s pyung apartment.