The actual conditions of school illumination was investigated. The illumination state was classified by the number of installed luminaires per 1 classroom. The illuminance was measured and analyzed. The work surface illuminance was up to the standard, but the illuminance on blackboard was below standard when there was no local lighting. As a result of conducting a simulation based on the measurement of the reflection factors of the classroom finishing materials and lamp replacement and lamp cleaning, nine luminaires for general lighting and local lighting for the blackboard were required, and a design considering illumination maintenance was called for.