Soil nailing is a method used to reach the stability of the slope by inserting a passive element into the slope. Reinforcing elements used in this method are usually high-yielding strength deformed steel bars or hollow tubes depending upon necessity. The nail is an important element in soil nailing. Estimation of nails properties forms the main part of the design process for soil nailing. The shape of the nail is one of the parameters which is essential to be careful with the design of soil nails along with the bond length and diameter of the nail. In this work, a model test is done to compare the performance of unreinforced slopes and reinforced slopes with soil nails under supplement load. The slope is created at an angle of 70 degrees for both unreinforced and reinforced slopes. The slope is strengthened with hollow aluminum tubes with a size of 25 mm. Shapes of nails used in this work are rectangular, square, circular, and flat projection. Nails are inserted at an angle of 15 degrees. The nail length is 45 cm. The failure pattern of slope and load versus settlement behavior of several unreinforced slopes and reinforced slopes are detected. From the model test, it is clear that the square shape of the nail has a maximum load-carrying capacity compared to other shapes; rectangle, circular and flat projection of nails.