Soil nailing is a mean of stabilizing earth slope by installing in situ closely spaced steel or plastic bars called nails in the ground. The installation is usually in progressive manner from top or bottom as excavation proceeds. There are many factors that affected the behavior of soil nailing system such as: horizontal and vertical spacing between nails, soil density, length, and method of installation. This research concerns on nail′s length, which is one of the most important factors. In this work, three dimensional laboratory model, 1760 mm x 850 mm x 1000 mm, was set up simulate nailed sandy soil slope of height 7.00 meter with model scale ‘'10''. The experimental program was designed and constructed to investigate the behavior of nailed soil slope system with 5.00 mm in diameter steel bars during, after construction, and under footing pressures at different nails length. The results indicate that increasing nails length up to a length equals to the height of the slope reduces the displacement of the slope face as well as settlement under footing with notable reduction. The system provides an economic, practical and effective method for slope stabilization.