Abstract: The transmission and environmental problem of structural vibration and the noise of urban underground or indoor substations have drawn more and more extensive attention. The 220 k V underground substation of Chaoyangmen and its coupled architecture are considered as the test object of study. firstly, two aspects of the analysis are carried out, one is the vibration transfer function and coherence function between different measuring points and the transformer vibration, the other is correlation spectrum and coherence function on vibration and the noise of the same point on different floors. Secondly, the correlation factor between floor vibration and noise and its corresponding relationship curves are acquired through calculation and linear fitting. Lastly, attenuation characteristics on floor vibration with horizontal and vertical distances are analyzed and fitted curve are acquired. The above analysis shows that spectrum characteristics of structure vibration and the noise in the substation and transformer tank vibration are very similar, and the vibration signal at each measuring comes mainly from the transformer. The overall correlation coefficient is 0.75 about the floor vibration and noise in substation and coupled building, and estimate formulas on the floor vibration and noise are acquired by linear curve fitting. Floor vibration has the non-linear attenuation characteristics with increasing horizontal and vertical distances, but when the distance increases to a certain value, the attenuation will not be obvious. In addition, the attenuation estimate formula of the floor vibration level with distance is obtained by nonlinear curve fitted.