Effects of rotational and continious grazing systems with four grazing intensities of heavy , medium , light and no grazing on soil moisture content, investigated in Bromus tomentellus pasture in Homand e abesard Station which located in 70 kilometer east of Tehran during Spring and Summer 2001. The grazing intensities and the grazing systems were analysed by a factorial – split plot in time design. The results showed that there was a significant difference between two grazing systems in heavy and light intensities. But the soil moisture of grazing intensities were higher than the control (no grazing treatment), and it was more when the grazing intensities were increased. Heavy grazing in rotational system and light grazing in continious system conserved more moisture than other treatments at the end of grazing season.