Energy is the important material basis of human survival and production. In recent years, many countries including China have gained many remarkable achievements of economic construction. At the same time, the huge energy consumption has became the focus of the world. Energy shortage, ecological problems and environmental problems caused by energy consumption will seriously impede the development of economy and affect our living environment.

With the continuous rising of total construction volume and the improvement of residential comfort, the building energy consumption is also rising rapidly. For example in China, based on current construction consumption development level, in the year 2020, the construction energy consumption in China will capture 35% of the total social energy consumption. This proportion will surpass industrial usage and it will becomes the top area of energy usage.