The window sash frame of aluminum alloy windows is large and can be embedded with a large area of glass, making the indoor light sufficient and bright, enhancing the contrast between indoor and outdoor facades, and making the living room more layered. Moreover, aluminum alloy materials have a light weight and high strength, which allows aluminum alloy doors and windows to have high cross-sectional strength even when the cross-sectional size is large and the weight is light. In addition, aluminum alloy itself is easy to extrude, with precise cross-sectional dimensions and high processing accuracy of profiles. Therefore, many homeowners choose to use aluminum alloy doors and windows in decoration.