The purpose of this study is to grasp the characteristics of outdoor spaces in the national university campuses by using the sky factor and the vertical direct daylight factor. The sky factor shows an openness of the outdoor space, and the vertical direct daylight factor shows a lighting condition. We computed both indexes about 100 campuses and compared it with the rate of building to site and the rate of floor to site. As for 12 campuses, it was examined about the influence which a change in the building arrangement exerted on both indexes and the building density indexes. The results are as follows; 1) Average of sky factor is closely related to the rate of building to site and the rate of floor to site. 2) Average of sky factor and vertical direct daylight factor are useful indexes which can show characteristics of arrangement of buildings.
