Abstarct: Exploitation of groundwater to fulfill the water daily needs goes back to very far past times. Today, using electrical resistivity studies performed on the ground, surface at a relatively low cost and fast, useful information can be obtained about groundwater resources. For this thesis, sounding data acquisition from about 200 electrical Sounding locations along 27 parallel survey lines having north-south direction were made in order to quantitatively and qualitatively investigate groundwater resources in the Saveh plain area. The survey lines were spread to the heights around the plain. Interpretation of the acquired resistivity sounding data was made, first, in one-dimensional form using master curves and IX1D and IPI2WIN software programs, and then, in two-dimensional form using RES2DINV and ZONDRES2D software packages. The information of the piezometer wells existing in the mentioned plain was used for better interpretation, and consequently, the resistivity, depth and thickness of the aquifer in the study plain were determined. The studies showed that the central parts of the plain were more important hydrologically because the water level depth in these parts is relatively shallow and the higher groundwater laxyer resistivity in these parts indicates better water quality, especially in the areas close to the south of the plain. As we move forward to the east of the plain, the depth of the water table decreases. Determination of groundwater quality characteristics such as its chemical, physical and biological properties, will show how suitable it is for the intended consumption. The nature of these characteristics is such that they affect the electrical resistivity measurements of the aquifer. Since one of the objectives of this study is to determine the relationships between hydrogeochemical changes and the results of modeling and interpretation of electrical sounding data. Linear regression method is used to determine the relationship between hydrogeochemical information, which includes electrical conductivity (EC) and total dissolved solids (TDS) of the wells, and the results of the interpretation of 6 electrical resistivity sounding locations adjacent to these wells. Studies have shown that with increasing the concentration of ions in groundwater, the resistivity of the water-bearing laxyer dramatically decreases. Among the provided diagrams showing these relationships, those that use exponential curves to fit the data, had higher correlation coefficients. This can indicate the curve-like or nonlinear correlation between the hydrogeochemical parameters and the resistivity of the water-bearing laxyer. In addition to hydrogeochemical data, hydraulic parameters such as hydraulic conductivity (K) and transmissivity coefficient (T) of 3 wells adjacent to the 3 resistivity sounding locations were also used. A linear relationship was made between the resistivity of water-beaing laxyer (ρ) and (K), and also, a logarithmic correlation was established between (ρ) and (T). Despite obtaining a relatively good correlation between hydraulic parameters and electrical resistivity, due to the small number of wells, and therefore, the lack of data, the validity of the results is not very high.