Building excavation failures, reported in recent years, indicate that further study is needed to improve designing and constructing of lateral support systems for such excavations. In fact, one of important issues in civil engineering is to stabilize vertical or sloped sidewalls of excavations in urban projects. Since the geotechnical characteristics of the site, are the most important and effective factor sin selecting and designing of deep system stabilization, making accurate and appropriate geotechnical studies prior to selecting, design and operation of deep stabilization would have a significant role on the rational progress and engineering design procedures as well as performance of braced excavations. In this research, by considering cases of stable and unstable constructed excavation, it was found that most of the failures occurring in building excavations are due to lack of appropriate arrangements for the retaining walls and /or inappropriate performing of the retaining systems. In accurate estimation of geotechnical parameters of the soil leads to wrong engineering judgment on many projects .Thus a comparison has been made between the limit equilibrium analyzes of lateral pressure deep retaining systems with Finite Element analysis through PLAXIS 2D 8.5 software. The comparison results show that similar to limit equilibrium analyzes the software analyses also accomplish based on the rotation of retaining system and formation of active and passive areas. Moreover, comparisons were made between the distribution of the driving pressures on the excavation support system in two different cases of full depth as well as partial retaining of excavations. The comparison results indicated that in the cohesive soils, retaining system maybe performed lower than the deep stability depth. Finally, parametric studies were made on three case histories to evaluate the accuracy of their design and performance. Keywords : Excavation, Retaining system, Limit Equilibrium, PLAXIS Analysis