Slope stability analysis is one of the most important topics in geotechnical engineering . Slope stability can be analyzed using one or more methods . Analytical and numerical solution are the famous methods . Limit analysis method used in this article to investigation of the nailing and composite systems (nail and anchor system). Nailing system can improve the slope safety factor but when use with the anchor system , we have the best behavior and the best safety factor . This system investigated in this article . We can increase the vertical spacing between the nails about 2m instead 1m when use the composite system and we have the higher safety factor values . SLIDE limit eqilibrium software used to preliminary analysis and PHASE2 finite element software used to final design and monitoring . Earth quake loading reduces the safety factor for the permanent wall too , so we consider the earthquake loading and investigated influence of it on safety factor value . When we use the nails at the middle of excavation height , we have the optimum and effective design than the other cases . This means the maximum force occurs in the middle of height of excavation so we repel it with the nailing system.