Optical stimulated luminescence (OSL) is a dating method to determine the last time that a sediment was exposed to light due to an event. Specific minerals such as quartz and feldspars are needed to determine the desired time. These minerals are wide spread and at least one of them exist in sediments. We applied OSL dating method to extracted quartz grains from collected Rafsanjani sediments. This provided an age of 131.5±10.4 ka which can be added to earthquake catalogs. An slip rate of 0.4 mm/year was calculated by dividing the Rafsanajan fault displacement (48±4 m) by OSL age. The slip rate is one of the main parameters for Earthquake Hazard Risk assessment and for determining fault activity.