This article mainly describes the development and application of FRP doors and windows in various climate,various environment and fields from aspects of energy consumption,construction,manufacturing and installation etc.

This paper makes scientific statement to the energy conservation by doors and windows,which is also the key content of building s energy conservation.

The article starts with fundamental concept of value engineering and expound the principle, measurement and features of VE as well as the necessity of applying VE to design of energy-saving doors and windows.

The actual states of China\'s energy-saving doors and windows,the energy-saving principles and technologies of the outside doors and windows were discussed,as well as the design measures to ensure energy-saving effect of the outside doors and windows in the building.

According to the analysis of background of architecture energy conservation and property of energy-saving door and window,this paper puts forward the direction of technique innovation of energy-saving door and window.

Here is a brief introduction of the types of energy-saving glass,some examples of its utilization at home and the latest research of the energy-saving glass at home and abroad.

The thermal properties of energy-saving glass are measured by the method of "Stable-Condition",and which are compared with general glass in the aspect of temperature-keeping property under the same temperature.