In recent years, energy crisis, environmental protection and improvement of living standards, require building energy efficiency, building energy conservation has is considered a global architecture of common choice in the future. What, then, energy-efficient buildings, what's good about it, to focus on you so? What building light environment design in the aspect of energy saving approach? This article will introduce some simple above a few questions. People's understanding of energy-saving building concept, after a period of time of development, from the initial blindly to save energy, to focus on reducing heat loss, now emphasizes to improve energy efficiency in buildings. Energy-saving building that is to say, doesn't mean sacrificing comfort, on the contrary, it requires high comfort more easily by means of the reality. It is generally believed that energy-saving buildings refers to the guarantee use