Abstarct: In order to investigate the status of the earth's laxyers, determine the depth of the rock formation, acting out seismic refraction data harvest and processed and interpreted . In this study, data obtained from seismic refraction in Dehmolla region processed with Seisimager software produced by Geometrics Company to obtain an overview of the subsurface structures of the area. The Pickwin program is used to extract the first arrival times of plotrefa for data modeling and calculating the velocity distribution and beam tracking. The usual preprocessing of the events was first performed and the time interval diagrams for each profile were plotted separately. In the following, these diagrams were processed by seismic tomography and rms error detection of profiles 1 to 6 show that there is good agreement between the modeling and geological results in all profiles. Finally, according to the compressive and shear wave velocities, a number of engineering parameters such as density gradient, density index, stress ratio and material index have been calculated. The velocity values and the engineering parameters indicate that the studied area is divided into two zones. The first zone represents the northern and western half of the lower quality soil and the second zone is located in the southern, eastern and central half of the study area where soil is better characterized.