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As early as the 1980 s, Europe developed high-performance system doors and windows, and its energy-saving performance, safety performance, and comfort far exceed ordinary doors and windows. The 2003 European door and window standard requires that the K value is not more than 1.4. High-performance system doors and windows are more popular. At present, the market application has reached 70% of the total number of doors and windows, while the average K value of doors and windows in China is about 3.5 (heat preservation). The current highest standard in China-Beijing door and window standard is the K value 2.8, which is only the 1984 European door and window K value standard. According to calculations, according to China's existing urban construction area of about 43 billion square meters, if the implementation of European
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