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We have decomposed the broad H-alpha, H-beta and H-gamma lines of 90 ActiveGalactic Nuclei (AGNs) into a superposition of a very broad and an intermediateGaussian components (VBGC and IMGC) and discovered that the two Gaussiancomponents evolve with FWHM of the whole emission lines. We suggest that theVBGC and the IMGC are produced in different emission regions, namely, VeryBroad Line Region (VBLR) and Intermediate Line Region (IMLR). The details ofthe two components of H-alpha, H-beta and H-gamma lines indicate that theradius obtained from the emission line reverberation mapping normallycorresponds to the radius of the VBLR, but the radius obtained from theinfrared reverberation mapping corresponding to IMLR, i.e., the inner boundaryof the dusty torus. The existence of the IMGC may affect the measurement of theblack hole mass in AGNs. Therefore, the deviation of NLS1s from the M-sigmarelation may be explained naturally in this way. The evolution of the twoemission line regions may be related to the evolutionary stages of the broadline regions of AGNs from NLS1s to BLS1s. Other evidences for the existence ofthe IMLR are also presented.

Evidence for an InterMediate Line Region in AGN's Inner Torus Region and Its Evolution from Narrow to Broad Line Seyfert I Galaxies