Abstract: The Raman spectra of the three differently colored single-crystal SrTiO₃ have been measured. At room temperature the Raman effect of SrTiO_s is a second order process. The Raman frequency shifts of samples with variant color are similar, but the Raman intensities are different. From Hall effect and XPS measurements we can conclude that the color centre of sample is caused by Oxygen vacancies. Oxygen vacancy cats as donor in the samples.