随着我国建设事业的发展 ,建筑门窗行业发生了巨大的变化。在国家有关化学建材的产业化和建筑节能等政策的引导下 ,塑料门窗近几年来 ,几乎每年以 2 0 %的速度增长。在新建住宅中 ,东北三省相当一部分大中城市的塑料门窗市场占有率超过了80 % ,北京、上海的市场占有率继续稳定 With the development of our country’s construction industry, the building doors and windows industry has undergone tremendous changes. Under the guidance of the state’s policies on industrialization of building materials and building energy efficiency, plastic doors and windows have grown at a rate of 20% every year in recent years. In the newly-built houses, the market share of plastic doors and windows in a large number of large and medium-sized cities in the three northeastern provinces exceeds 80%, and the market share in Beijing and Shanghai continues to stabilize.