Аннотация:The evolutionary synthesis method is applied to calculate MgI+MgH 5150A, and TiO 7150A absorption features of integrated spectra and integrated UBV colors of a stellar system. These calculations are used to investigate star formation rate in nuclei of some spiral galaxies. The (IMg,B-V) diagram is shown to be a good discriminator between metallicity and star formation effects. Star formation rates, metallicities, and initial mass function slopes are obtained for the nuclei of 8 spiral galaxies. Star formation rates in the nuclei correlate with rotation velocities of the galaxies. Dynamical friction of gas clouds system in a galactic stellar disk is a possible cause of that correlation.