The experiments in this paper employed the strains of Bacillus HRS4 isolated from oil reservoir. By growing in the facultatire aerobic condition the cells acted on selenite. After 36 hours, all the samples with sodium selenite radical from 1mM up to 11mM produced many red deposits. Under biomicroscope the authors found one or more red round intracellular deposits in the cell with free floating deposits outside the cell. Intracellular organization of deposits includes one or two regular chains, curve or irregular in form. The XPS patterns of the deposits show that the sodium selenite has been exclusively reduced to elemental selenium. Furthermore, glucove in the culture media can impact greatly the quantity of the deposits of the reduced elemental selenium.