Due to recent sudden rise in oil prices, there is a need of reducing energy consumption in buildings, and the lighting energy takes the largest part in the total energy consumption. Energy consumption on buildings and industries accounts for approximately 85% of total energy consumption. Previous studies were carried out only with regard to the planar light shelf and curvature setting, but were carried out, but the pleasant indoor environments have not been provided due to problems such as the glare effect. Therefore, the purpose of this study is to strengthen the weak points on the glare effect and analyze the performance to bring daylight deep into indoors by applying the curvature to the light shelf for the diffusion of light. In this study, different curvature and angle of light shelf were applied and lighting performance and diffusion effect were displayed in diagram form verifying its efficiency in energy saving. Keyword: Light-Shelf System, Curvature, Angle, Glare