Modern building doors and windows can be roughly divided into plastic windows, composite windows, and aluminum alloy windows according to the types of profiles. Among them, aluminum alloy windows are the main building doors and windows in my country today, accounting for a considerable proportion in today's buildings. In fact, aluminum alloy windows have their advantages in terms of wind pressure resistance, water tightness, air tightness, and environmental protection. This is because compared with plastic windows of the same section, the moment of inertia of aluminum alloy windows is 3-4 times that of plastic windows; with the use of thermal insulation bridges in aluminum alloy profiles, the thermal insulation and thermal insulation properties of aluminum alloy windows are greatly improved. It is very suitable for the energy-saving requirements that are vigorously advocated today.