Abstarct: The liquefaction phenomenon is always come alongside with reduction of stiffness and shear resistance for soils and is observed in most of the time when earthquake with high frequencies occur. The basic mechanism of liquefaction in saturated loose sandy soils laxyers is the graduate increasing of pore water pressure due applying cyclic stresses from spreading of shear waves of earthquake. Liquefaction of saturated loose sandy soils cause vast destructions in different ranges of structures, Hence, its necessary to developing of settlements for structures that all or just some part of their foundations are in danger with liquefiable soils. According to some recorded reports from some sites with high potential of earthquakes, that’s shows the effect of dilation in soil structures on cyclic shear deformation site during liquefaction phenomenon. Algemal et al (1998) proved that expansion in sandy soils cause increasing on shear resistance during liquefaction phenomenon. In this present study, the effect of dilation on structures settlement during liquefaction with using of OpenSEES software has been analyzed. OpenSEES is a open source software that with finite element method is analyzing various kind of Semitic problems. Previous studies show that dilation has been affected by natural properties of soil (like relative density) and existing stresses in soil profile, then for analyzing the dilation angle during liquefaction and its resistance influence on structures settlements a saturated sandy soil laxyer with various range of relative density (30,40,50 & 60%) has been considered. The results show decrease in pore water pressure and settlement due liquefaction with increasing in dilation angle.