Currently the world is facing the energy problems. So energy saving have become a big issue. But the building's energy usage is increasing by the higher, larger, specialization buildings. 22% of total energy usage is lighting energy. So reducing the lighting energy is large part of reducing building's energy usage. Current, using light to save energy are being research actively. Among the ways to use daylight, there are automated roller shading system. That adjust roller shade height through the sun's change. Automated roller shading system can block direct sunlight and enter useful sunlight. In this paper, for knowing the usefulness of automated roller shading system using fuzzy inference, build automated roller shading system of two cases(using fuzzy inference and using sun's changing) and compare system using the fuzzy inference with system using the sun's changing. As a result, fuzzy control system has higher intensity of illumination and uniformity factor than using sun's changing automated roller shade system.