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The spectral properties of a sample of 58 Active Galactic Nuclei (AGN) spectra, in which emission [O III] λλ4959, 5007Å lines are weak or totally absent, are analyzed. In order to investigate the physical reason for the [O III] emission suppression, the spectral properties of the weak [O III] spectra sample are compared with the same properties of a sample of 269 spectra with the strong [O III] lines. The spectra are obtained from Sloan Digital Sky Survey (SDSS) Database. It is found that thedoi:10.2298/saj1182017k fatcat:cuysvvo3gnfhtmc24fpd5flfle