Under the environment where more focus is being shifted to open spaces of apartment complexes, this analysis stared with a critical mindset that it is difficult to establish proper standards indicating livability levels based only on criteria such as the building-to-land ratio, floor area ratio, etc. That is, it is necessary to develop criteria for evaluating livability in an apartment complex. Therefore, the goal of this study is to establish a new plan for livability criteria, by investigating the livability criteria of an apartment complex and analyzing it by utilizing evaluation methods implemented in other foreign countries. Open space and livability criteria of households have been investigated and analyzed based on 41 apartment complexes over 46 years from 1962 to 2008. These livability criteria are selected based on the criterion of the Land Use Intensity (LUI) of the Federal Housing Administration (FHA). The results are shown below. First, apartment density has been both increased and decreased, undergoing various changes. Second, various kinds of criteria of households have been increased and decreased by various factors according to social changes, but they have increased since 2000. Third, the building-to-land ratio has maintained similar changes within the range legally allowed. Finally, the average volume of open space in an apartment complex has decreased slightly. As a result of synthesizing the factors causing such changes, various building types and manhattanization, mandatory construction of underground parking lots, mandatory designing of tower type buildings, and the introduction of green building certification systems are some. Through this study, criteria were set up in order to secure comfortable open spaces in an apartment complex and establish proper environmental standards in consideration of the number of households that actually live there. Also, such criteria have been utilized to analyze factors that changed through the correlation between the criteria, according to the changes of the times. This analysis is meaningful in that the livability criteria data obtained during the 46 years of the study have been arranged so as to form the basic data required for establishing livability criteria in the future.