To construct a suitable structure, the quality of the inappropriate soil should be improved in terms of geotechnical engineering parameters so that the soil have a good performance due to the structural forces. By the development of technology, we can see the improvement in the soil improvement methods and the innovation in the new soil improvement methods. The common soil improvement methods are as follows: compaction; overloading, drainage, using insitue reinforcement (such as stone or sand columns), slurry injection and chemical stabilization. The technique of using stone columns is one of the poor soils improvement methods such as clays, silts and silty sands which has been proved their efficiency and their environmental compatibility. The purpose of this paper is studying the effect of elasticity modulus of column materials on the behavior of stone columns. The analysis have been done through PLAXIS software. The results show that by increasing the elasticity modulus of column materials, the amount of stone columns settlement and displacement will be decreased, and the stiffness ratio of column materials and the surrounding soil will be suitable between 2 and 6 percent