According to the latitude , longitude ,height of the building, according to the location of the sun moving building and block the formation of the shadow to calculate and control all of all shading devices, the angle adjustment by 365 days system clock. In summer, system control electric device to block out the strong sunlight, keep the indoor low temperature to prevent light pollution, less air conditioning; in the winter, with the sunshine warm light to help raise the room temperature, the less air conditioning to save a lot of energy. Automatically when lit with the brightness sensor with dim or turn off the lights automatically when insufficient light, brighter lighting, to ensure both constant illumination.