Abstarct: Exploration methods are divided into two categories of direct and indirect methods. Direct methods, such as exploration drilling, are costly, time-consuming and highly accurate, but indirect methods, like geophysical methods, require less cost and time although interpretation of their results is difficult. In this research, the efficiency of geoelectrical sounding method in determination of water-bearing formation is investigated, and also, the interpretation results of the Schlumberger sounding curves corrected by two graphical and mathematical methods are compared. For this purpose, data from 76 geoelectrical sounding points on 9 lines in Aman Abad area near Arak City have been interpreted by master curves, and then, one-dimensional (1-D) modeling of the data has been made using IX1D software. Moreover, to compare the two graphical and mathematical methods for correction of the Schlumberger sounding curve, 1-D modeling of the data has been made using IPI2Win software, and then, the results obtained from the two methods have been compared with geological and wells data in the area, and thus, the higher speed of mathematical correction method and higher accuracy and precision of the graphical correction method have been verified. Furthermore, two-dimensional (2-D) modeling of the geoelectrical data from every survey line has been carried out using Res2dinv software. The 2-D modeling results have been compared with 1-D modeling results, information from adjacent wells and geological data in the area. The modeling results have been used for determination of aquifer geometry, separation of alluvial laxyers, determination of bedrock depth, recognition of folding and faults, determination of the lithology of the subsurface laxyers, preparation of iso-potential map and direction of groundwater flow in the area. In general, the results show that the groundwater table, similar to the topography trend existed in the area, decreases from south to north direction. By investigating the obtained isopiez map, we can conclude that the groundwater flow direction is also from south to north. Furthermore, the interpretation results indicate that the resistivity values of water-bearing formation and thus, the quality of groundwater vary in the whole area. In southern parts of the study area, the resistivity of water-bearing formation is 50 to 80 ohm-meter and groundwater has better quality, but its quality is lower in central and northern parts of the area. In addition, the bedrock is mainly limestone that is located at lower depths in eastern, western and southern parts of the area due to the performance of main and probable faults in the area. However, the bedrock in central and northern parts of the area is situated at relatively high depths.