Abstract: The influence of different structure parameters on sound insulation performance of double-glazed windows are studied experimentally, including glass structures and specifications, open mode and sealing form, spacing between double windows and window frame profiles. The results show that glass structures and specifications have small effect on the weighted sound isolation of double-glazed windows, and the frequency characteristic curves of air sound insulation quantity for them are similar, and the resonance frequency mainly appears in 160~250 Hz. The sound insulation performances of the double-glazed window with outswing and inner sliding forms are basically the same as the double swing windows, but better than the double sliding windows significantly. Furthermore, using of coated seals instead of seal strips is effective to enhance sound insulation for double-glazed windows. When spacing between the double windows is greater than 90 mm, the sound insulation performances are almost the same, which are superior to the double-glazed windows of 80 mm spacing.