Abstarct: Soil as construction material in various projects as well as support for foundations used. Civil engineers trying to improve the soil strength using mechanical methods to improve and stabilize or using reinforcement techniques. One of these methods that improve soil behavior is soil nailing. So far, various materials such as glass fibers (fiberglass) used in polyester resins, inert mextals such as aluminum or stainless steel, zinc plated steel (galvanized) and polymer such as geotextiles, geogrid, geocomposite, coated fabrics, tapes, rigid plastics and elastomers has been worn for this purpose. Various methods are used for stabilization area of nailing method, of which more applications. In this study we tried this method and wished for better , safer and less expensive to stabilize the soil to replace the old methods. The aim of this study is to deepen stable supply of optimized supporting structures is by creating a layout that is optimized angle and length to given nails to prevent a deep rupture and deformation, that modeling is performed by Plaxis and Flac softwares. To do so we modeled in these two numerical method software .We tried modeling of nails in 2D models in Plaxis and 2D and 3D models in Flac and compare the results of these models. In this study, transformation and stability, and retaining structures at depths of 9 and 14 meters in nailing two laxyers of soil conditions and the state of implementation of nails at an angle of 10 degrees and with varying lengths investigated.