This research is directed to evaluate the relation ship between sub base resilient modulus (Mr) with uniform dry density during testing; only the deformation in the central portion of the specimen is measured. It is noticed that the divided layer of sub base sample is affected by the period of soaking and reflects this effect on the ( Mr ) of the material .In this research ,the samples from the Nibaee quarry were took. These samples were representing the lower limit of gradation of the specification. The specimens were classified into two groups. The first one is soaked for a period of two days and the second group was soaked for four days.