: In recent years, with growing the world's population, the availability of appropriate lands for constructional purposes are declining. Thus, in the most of advanced countries, the development of buildings toward modified marginal lands as well as growing skyscrapers have been followed as proper solutions for this problem. In this context, the need to improve and modify inappropriate lands has attracted intense competition between civil engineers in the developing countries. In fact, this approach has been emerged as an essential necessity for the development of basic infrastructures within civilized societies. The first basic step in engineering projects is the availability of land for construction of a building. Soil stabilization is one of the common ways to improve mechanical properties and enhance the soil performance in these projects. Moreover, with increasing demands for controlling and verifying the seismic stability of soil structures including seismic response analysis of stabilized soils for micro-zonation purposes, it is necessary to study the dynamic behavior of stabilized soils. The extent and distribution of earthquake damages are highly influenced by the soil response to dynamic loading. This response is largely controlled by soil dynamic parameters. The behavior of the soils under dynamic loading is dependent on the factors commonly referred to as dynamical properties of the soil. The most important properties are the shear modulus and the damping ratio. In this research, using powdered resin of polyvinyl acetate (PVA), the stabilization process of a sandy soil, as well as changes in the shear modulus and damping ratio of the soil samples prepared at different relative densities of 45, 55%, and 65%, and stabilized with 1 and 2% PVA resin, and loaded under three stress ratio levels (0.25, 0.35 and 0.5) have been considered. For this purpose, static uniaxial and triaxial tests were first used to evaluate the behavior of stabilized soil samples. The cyclic triaxial tests were then used to investigate the changes in the dynamic parameters including shear modulus and damping ratio of the stabilized samples under various cyclic load levels. The results obtained from uniaxial tests showed that the compressive strength of the soil is increased continuously by adding the amount of PVA resin. As a typical result, adding 2% resin to the samples prepared at relative density of 45% caused 5.7 times increase in the compressive strength of the samples. The results of cyclic triaxial tests also showed that the soil shear modulus will increase significantly in samples with 2% added resin. Furthermore, the shear modulus increased with increasing the samples density. The increase in the stress ratio involved with adverse effect and reduced the soil shear modulus. Also the study results showed that the soil damping ratio decreases with increasing the resin additive. Moreover, increasing the soil density and the stress ratio reduced the damping ratio. Keywords: Soil stabilization, PVA resin, Shear modulus, and Damping ratio.