This study has analyzed that the changes in the composition of floor plan and room area ratio of the apartment unit as public leasing houses from 2002 up to now on 2010, distributed apartments in Daegu. Even though there is a little ratio changes in every year, the whole changes of the spaces in public use such as living room, kitchen/dining room area is upward trend, on the other hand the individual use such as bedroom, passage area is downward trend. The most changes of the unit spaces was Dinning/Kitchen area because the area is getting centered of activities of the house and controlled by housewives whose role is more important in these modern life. These changes would reflect to unit plans of the future public housing as a reference materials focused on small sized apartment unit.