Abstarct: In general, excavation and stabilization of underground structures is one of the most important issues in geotechnical and civil engineering. Today, due to the increase in construction, especially in areas where the groundwater level is high, they use diaphragm walls in excavation; Diaphragm walls, in addition to ease of implementation, can also be used as a waterproof laxyer and they can be used in excavations with higher depths. In this study, after verification of various laboratory and numerical studies, the three -dimensional simulation of the diaphragm walls up to 10 meters deep has been investigated in different soils. The results of this study showed that the maximum horizontal displacement of the diaphragm walls observed in the middle. On the other hand, the stress concentration is more in the corners of the walls and considering a proper discontinuity between the walls at the model corners can help reduce this stress concentration. Due to the results of these study, in silty sand, diaphragm walls can easily implement up to 10 meters. Also, the results reveals that the behavior of the diaphragm walls in the clay soils are much more complex and does not have linear behavior in different thicknesses, although increases in the wall thickness can reduce walls displacement in all cases.