English：

Driven by the pursuit of a green, healthy, and livable environment—particularly the growingemphasis on indoor acoustic quality—this study centers on the “constant quietness” aspect within “five⁃constant” residential buildings （which maintain constant temperature, humidity, oxygen level,quietness, and cleanliness）。 Through field investigation and on⁃site measurement of a specific five⁃constant residential project, the indoor sound insulation performance was evaluated. The research revealsthat the penetration of indoor air⁃conditioning pipe shafts through floor slabs creates sound bridges,leading to airborne sound transmission between upper and lower floors. Additionally, openings for airsupply and return above doorways compromise the sound insulation performance of partition walls. Theseissues were confirmed by measurement results. Based on the field data, key technical points for thedesign and construction of sound insulation systems in five⁃constant residences are proposed, coveringwalls, floor slabs, and indoor air ducts （shafts）。