Accelerated soil erosion on cultivated lands is a serious global problem, especially in hilly regions with undulating topography. Soil erosion not only results in on-site soil degradation, but also leads to off-site problems related to downstream sedimentation as well as surface and ground water pollution. It reduces soil productivity as result of loss of soil organic carbon and plant nutrients. There are two general approaches for assessing the spatial characteristics of sediment flux on hill slopes. The first is the use of soil morphology information such as observations of buried A-horizons or profile truncation to determine net gain or loss at a point. The second general approach is the use of radionuclide tracer inventories relative to known fallout, which may be used to quantify the accumulation or loss of soil to which the radionuclide is adsorbed. 137 Cs (half-life of 30.2 years) deposited on land became tightly adsorbed to soil fine particles as by clay minerals and organic matter and was concentrated in the surface layer. Its subsequent vertical and lateral redistribution are controlled by the erosion, traort and deposition of soil and sediment particles. Magnetic techniques provide a rapid, sensitive way to characterize sediments in aquatic environments, and have also been used to study soil erosion and trace topsoil movement on a hill slope. In the Chehlgerd region of Chahrmahal Bakhtiari Province, soil erosion rates have increased greatly over natural rates as a result of human activities. Therefore, the objective of this study was to evaluate the efficacy of magnetic measurements for assessing soil redistribution by comparing with Cs-137 technique results. Also, comparison of simple mass balance and proportional models was the other goal of this research. The selected study area was located at hilly region of Chelgerd, Charmahal Bakhtiari province in west of Iran. At first, the digital elevation model (DEM) was derived from the interpolation of topographic map. Then primary and secondary topographic attributes were extracted from the DEM by Topographic analysis system (TAS) software. Based upon the landform features, ten transects were established and in fifty points from two depths (0-30 and 30-50 cm), one hundred samples were collected in an area of 50 cm 2 . Also in the seven points in reference site, the sampling was done with 5 cm increments to 40 cm soil depth. The dried soil sample were sieved to pass through a 2 mm screen after 2mm fine earth was weighed about 500 g for 137 Cs analyses by gamma-ray spectroscopy. In this study, a set of environmental magnetic parameters including magnetic susceptibility at low frequency (?lf), saturation isothermal remanent magnetization (SIRM), isothermal remanent magnetization (IRM 100mT ) were measured. Magnetic