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We have investigated the ensemble regularities of the equivalent widths (EWs)of MgII 2800 emission line of active galactic nuclei (AGNs), using a uniformlyselected sample of 2092 Seyfert 1 galaxies and quasars at 0.45 <= z <= 0.8 inthe spectroscopic data set of Sloan Digital Sky Survey Fourth Data Release. Wefind a strong correlation between the EW of MgII and the AGN Eddington ratio(L/L_Edd): EW(MgII) \propto (L/L_Edd)^{-0.4}. Furthermore, for AGNs with thesame L/L_Edd, their EWs of MgII show no correlation with luminosity, black holemass or line width, and the MgII line luminosity is proportional to continuumluminosity, as expected by photoionization theory. Our result shows that MgIIEW is not dependent on luminosity, but is solely governed by L/L_Edd.

Eddington ratio governs the equivalent width of MgII emission line in active galactic nuclei