Abstarct: Among various geophysical methods, the GPR can detect sub-surface heterogeneous inferior depths with higher resolution and better detection. One of the most suitable methods for studying this method is to determine the location of cavities near the surface due to the considerable contrast in the electrical and electromagnetic properties of subsurface cavities with the surrounding area. For this purpose, a two-dimensional study with data acquisition in a Residential – administration area in Mashhad, using an antenna with a frequency of 350 MHz, with a resistivity profile with pol-dipol arrays corresponding to one of the GPR profiles. In the initial radar, the symbols for the desired target were not well observed, so using the appropriate processing parameters such as the DeWOW filter, AGC, Background removal filter and Running average filter, a final optimal radar was obtained. Also, after modeling and interpreting the resistivity profile and comparing it with the final radar, it is observed that in the GPR method, the depth of penetration in conductive media is very low, and its use in such environments is recommended when the target is at a low depth. But the resistivity method, in conducting environments, has a much higher penetration depth but less resolution. Wave velocity analysis for determining the depth of the target was performed using the Hyperbolic fit method in ReflexW software. Estimating the velocity of this method is approximately equal to the mean velocity of the velocity according to the genus of the studied region. The soil contains amounts of silt and clay and sandy intermediate laxyers. The results of this study show that the GPR method was not successful in detecting subsurface cavities at depths of more than 1 meter due to the studied genus, which is mostly fine-grained. But the resistive method, due to the depth of penetration, has been able to find the cavity in greater depth.