The late Quaternary lacustrine sediments in Jula Nur of Hulun Lake basin consist of sandy and muddy clastic deposits. The low and high frequence magnetic susceptibility of the samples from of East Open Cut Mine section has been measured. Also, grainsize, magnetic minerals and contents of Fe₂O₃, Al₂O₃ of the samples have been analysed. The results indicate that magntite is the main contributor of magnetic susceptibility of sediments, and the total Fe content controls the changes of the magnetic susceptibility which correlates negatively with the grainsize of the sediments. Further study shows that the magnetic minerals are mainly silt-clay clastic deposits, resulting in higher magnetic susceptibility. The frequence-dependent susceptibility of sandy deposits is very high, due to finer magnetic grain than those in silt-clay clastic deposits.