China's energy consumption per unit building area is 2-3 times that of developed countries, causing heavy energy burden and serious environmental pollution to the society, China to walk the road of sustainable development, to energy-saving building materials and green building. The development of the construction industry, especially the development of building energy efficiency, needs the support of building materials industry. Energy saving is one of the important work of domestic residential construction, building energy conservation is one of the basic national policy of national development, with China's construction energy conservation work carried out, and the urgent needs of the people to send the thermal environment building, building energy-saving technology will be developed rapidly.
Therefore, to grasp the building energy saving design, rational use of energy-saving design methods, improve the effective utilization of energy, will promote the national and local building energy efficiency, promote the whole society building energy-saving technology progress. In the design of energy-saving building insulation materials should be selected, the purpose is to reduce the heat loss in winter, need to keep indoor temperature, radiant heat from the sun in summer; or in the hot summer and warm winter area of the building walls and roofing construction, radiant heat from the sun.