1. Before opening the windows, the doors and windows should be replaced first, because the removal process will damage the indoor and outdoor walls, and the doors and windows should be replaced before the next decoration. In door and window decoration, high-quality door and window brands should be selected, because the quality of door and window profiles will determine the entire door and window grade, sealing and anti-aging issues. 2. To buy the accuracy and strength of doors and windows, you must go to the regular building materials market to buy doors and windows, especially some inferior plastic doors and windows, the quality of the lining steel is not good, or even no lining steel, and other parts are also very poor. 3. The appearance of some plastic doors and windows is too white or gray, indicating that the doors and windows are decorated with doors and windows, and the internal stability of the material is not enough, and it is easy to age and turn yellow over time. 4. Check the flexibility of the hardware. Sashes and sashes should be equipped with aluminum slide rails for easy replacement. There should be a fixing part in the middle of the sealing surface of the sash, which is the key to the sealing performance of the sliding window. 5. The window frame and the wall should be filled with foam plastic, and the inner and outer frames must be sealed to prevent the silicone glue or sealant from seeping into the water. Remember, after installation, the user should remove the protective film to extend the life of the doors and windows.