Abstarct: In recent years, applying GPR method in investigating depth and engineering fields has been increased because of its high accuracy and speed. GPR method baxsed on relative electrical permittivity between the two environments is introduced as a target exploration. In this study, GPR method, have been studied for soil classification and agricultural suitability. For this reason, the method to evaluate the subsurface soil on the farm, Bastam (Shahrood campus) has been used as a case study, and 4 Radar profiles along the grid lines designed and surveyed. Then with appropriate filters applied on data processing and interpretation of the results and also the relationship between the GPR method and gender or type of soil and determine the approximate amount of granular material, fine and coarse grain (Clay, silt and sand) baxsed on GPR results, descxriptive categories studied include humidity, soil type in terms of fine and coarse grain and other physical properties of the soil was done. Moreover, for verification or calibration results, with a hand drill in the agricultural field Bastam number of samples in the shallow subsurface soil samples were taken and the characterization and classification of soil samples with carrying out tests set texture and set the humidity level in the laboratory university, and obtained results were compared with the processing, analysis and interpretation of GPR data. Generally, the results of laboratory soil samples taken from different depths and relatively low beneath the Earth's surface is acceptable. High penetration depth of the radar waves in the central part of the profiles of a number of clay and low humidity in this part attributed these results also agree well with experimental results. Also the minimal depth of penetration of radar waves at the beginning and end of profile 3, indicates the high electrical conductivity of the subsoil due to high humidity and dense clay material in this section, that have been also confirmed by the experimental results. Therefore, the GPR method is relatively inexpensive, quick and is possible to determine the type of soil, humidity and grain coarse and fine grain and finally, a descxription scheme for classifying subsurface soil and other soil physical properties, Suitable for agriculture or not.