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We determined the spin value of supermassive black hole (SMBH) in activegalactic nuclei (AGN) with investigated ultraviolet-to-optical spectral energydistribution, presented in the sample of Shang et al. (2005). The estimates ofthe spin values have been produced at the base of the standard geometricallythin accretion disk model and with using the results of the polarimetricobservations. The polarimetric observations are very important for determiningthe inclination angle of AGN disk. We presented the results of ourdeterminations of the radiation efficiency of the accretion flow and values ofthe spins of SMBHs, that derives the coefficient of radiation efficiency. Themajority of SMBHs of AGNs from Shang et al. (2005) sample are to be the Kerrblack holes with the high spin value.

Constraints on Spin of a Supermassive Black Hole in Quasars with Big Blue Bump