China's plastic-steel doors and windows started late, and the quality of calcium-plastic doors and windows produced in the 1970s was not enough. The production of real plastic doors and windows began with the introduction of equipment in 1983. At that time, the technology was not very advanced. They all used single-cavity or two-cavity structural profiles. With the improvement of the industry in 91 years, a number of extrusion equipment and molds emerged in China. Manufacturers of profiles, assembly equipment, etc.; In 1996, with the birth of the newly introduced manufacturers of advanced equipment in the 1990s, the company has greatly promoted the development of the industry. Now there are more than 2,000 extrusion lines in the country. More than 400, more than 3,000 assembly plants, 99-year profile production capacity of 800,000 tons, annual assembly of doors and windows capacity of 60 million square meters, has now become one of the few fast-growing industries in China. Plastic steel doors and windows are being accepted by users with their excellent performance.