Abstarct: Landslide is a natural disaster that occurrs in many countries of the world, especially in mountainous countries causing significant financial harms and losses. In our country, there are plenty of areas prone to landslides with high seismicity and rain fall. Therefore, it is necessary to study the stability of landslides and stabilize them if necessary in these areas. There are many methods for stabilizing the slopes, including the shear key, re-profiling of the ground surface, surface and sub surface drainage, and etc. All these methods have at least one limit. Discrete pile rows have been used for decades to stabilize landslides. When these piles are exposed to landslide or failure along the slope, they reduce the movement of the soil by their function. Discrete piles have significant advantages. For example, in areas where construction is so common, these piles can act as a foundation for new buildings, while reducing the lateral movements. In this thesis, the behavior of the pile row in the stability of large landslides under earthquake load is investigated. First, a comparison was made between the baxse model (without a pile row) and the model stabilized by a pile row. In the model stabilized by a pile row, the displacement of the toe of the slope was reduced by 95% compared to the baxse model, which proves the effectiveness of using the pile row in the stability of the slopes. Then, the behavior of the model stabilized by a pile row against the change in the resistance of the slip surface under four different earthquake loading considering three different strengths of the slip surface was investigated, and it was observed that by decreasing the slip surface resistance, the shear force and bending moment applied to the pile increased. Also, by placing the pile row in the toe, middle and crest of the slope, the effects of the position of the pile row on the displacements of the slope were examined. By studying the results, it was observed that the optimum location of the pile row to stabilize the slope is in the middle of the slope and there is no need to place two pile rows on the slope.