Abstarct: In this study, tomography studies of electrical resistivity and GPR were performed in Geophysical test site of Shahrood University of technology and at two points in times with the aim of investigating the changes caused by pollution leakage in the ground. The stages of the studies have been controlled in accordance with the changes that have taken place. The purpose of this study is to investigate and estimate how the electrical properties change due to the leaching of water flow in an alluvial ground and also the changes caused by the filling or emptying of a buried polyethylene pipe. In this regard, electrical resistivity and GPR data obtained from the studied areas in two time periods have been processed and interpreted. The designed profiles include four lines on a buried reservoir and five profiles on alluvial soil. The results of this data are in the form of two-dimensional models of electrical resistivity and GPR cross sections; which have been obtained using RES2DINV and Prism2 software, respectively. the most important results of this study is the relatively good performance of the electrical resistivity method in details detection and inefficiency of GPR in alluvial soils with high clay, the unsuitability of the transmitter antenna with a frequency of 150 MHz in the GPR method and the destructive effect of moisture on the performance of this method. Using specific electrical resistance data, ground details such as polyethylene reservoir, loose and porous soil parts and separation of different areas according to the relative humidity in them have been revealed.