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A two-components model for Broad Line Region (BLR) of Active Galactic Nuclei(AGN) has been suggested for many years but not widely accepted (e.g., Hu etal. 2008; Sulentic et al. 2000; Brotherton et al. 1996; Mason et al. 1996).This model indicates that the broad line can be described with superposition oftwo Gaussian components (Very Broad Gaussian Component (VBGC) and InterMediateGaussian Component (IMGC)) which are from two physically distinct regions;i.e., Very Broad Line Region (VBLR) and InterMediate Line Region (IMLR). Weselect a SDSS sample to further confirm this model and give detailed analysisto the geometry, density and evolution of these two regions. Micro-lensingresult of BLR in J1131-1231 and some unexplained phenomena in ReverberationMapping (RM) experiment provide supportive evidence for this model. Our resultsindicate that the radius obtained from the emission line RM normallycorresponds to the radius of the VBLR, and the existence of the IMGC may affectthe measurement of the black hole masses in AGNs. The deviation of NLS1s fromthe M-sigma relation and the Type II AGN fraction as a function of luminositycan be explained in this model in a coherent way. The evolution of the twoemission regions may be related to the evolutionary stages of the broad lineregions of AGNs from NLS1s to BLS1s. Based on the results presented here, aunified picture of hierarchical evolution of black hole, dust torus and galaxyis proposed.

Evidence for an intermediate line region in AGN's inner torus region and its evolution from narrow to broad line Seyfert I galaxies