Railway bridges through the downtown region is an excellent bridge type noise reduction performance is required. According to this request, the bridge of the noise barrier installation is not required and low vibration is under development. This railway bridge is PSC U-Type lower route railway bridge with sound absorbing system. Because the bridge cross-section wraps a train and web contains the sound-absorbing system, noise is reduced. In this study, we analyzed the noise reduction performance of PSC U-Type lower route railway bridge with sound absorbing system using general noise analysis program.