Abstract: The research situation of indoor soundscape and floor reflected sound in recent years are introduced in this paper. By combining experimental psychological study and subjective evaluation of indoor soundscape, the absolute thresholds for sensation of human to three kinds of sound signals with or without floor reflection in four rooms are determined through three auralization experiments based on reflected sound perception. The results show that the human voice signal can be detected when it is 10 dB(A) higher than the background noise, while the stream sound and music sound can be significantly detected only when it is 17 dB(A) higher than the background noise. Finally, suggestions for processing floor reflection are given according to the experimental results.