Abstract: In order to explore the noise reduction effect and application of different hearing protectors in different workplaces of pumped storage power station, and to facilitate staff to select suitable hearing protectors according to different needs, the principal component analysis and evaluation are made for the test results of noise protection insertion loss of 112 kinds of hearing protectors. Combined with the field test results at 10 workplaces of a pumped storage power station, it is shown that the 112 kinds of hearing protectors mostly are suitable for use in 7 workplaces of the station:(1) in the sound insulation cover of the 1^# generator, (2) outside 1^# water truck room, (3) inside 1^# water truck room, (4) outside 2^# tailwater cone chamber, (5) the maintenance door of 2^# tailing cone pipe, (6) outside 3^# tailwater cone chamber, and (7) the maintenance door of 3^# tailing cone pipe. Other places need to be targeted to select suitable hearing protectors. This paper can provide a reference for the selection of hearing protectors in other different workplaces.