Abstract: The noise from construction equipment is one of the main internal noises in buildings. In this article, the spectral characteristics and sound quality of construction equipment noise are analyzed, and the feasibility of using sound quality parameters to evaluate the influence of civil construction equipment noise, especially low-frequency noise, is discussed, so as to provide a new idea for selecting appropriate noise control measures to reduce equipment noise pollution in the future. Four types of common equipment noise sources in buildings are selected for the research:variable frequency pumps, power distributors, exhaust fans, and outdoor air-conditioner units, and their characteristics are discussed from two indicators of sound energy and sound quality. The ‘Head Acoustic’ digital artificial head system is used for sampling the noise, and the ‘NOR140’ noise analyzer conducts the noise measurement simultaneously. The spectrum characteristics of the noise are analyzed by the ‘ArtemiS’ spectrum analysis software to calculate the indicators such as sound energy distribution and sound quality of each frequency band. The results show that the noise of the outdoor air-conditioner units causes the greatest annoyance among the measured equipment noises; the peak of the sound level of the variable frequency pumps is located at high frequencies (15.2~24 Bark), the energy ratio and loudness distribution of the noise at high frequencies are nearly 50%; the peak noise levels of other equipments are located at low frequencies (0~3.4 Bark), and the proportion of sound energy is also the largest; the loudness distribution at mid frequency (3.5~15.2 Bark) is more than 50%, and near 30% at low frequencies.