Permanent deformation is an important factor in flexible pavement design. Through increasing traffic load and tire pressure most permanent deformation occurs in the upper layer rather than in subgrade Wheel tracking is a popular HMA test, since it simu- lates the permanent deformation resistance of mixtures. The basic similarity of these devices is in using a cyclic wheel passing through the surface of specimens, and the cumulative rut after the proposed cycles is used as a measure of rutting potential. The wheel tracking test is undertaken using the Iran University of Science and Technology, ABRC Wheel Track machine, by applying 8000 cycles of wheel load of 50kg that turns around an axis and applies the wheel load to specimens. The test was done at 60 oC.In this study, the rutting performance of hot mix as- phalt specimens made with bentonite as bitumen mod- ifiers were studied. 10%, 15%, 20%, 25% and 30% ben- tonite content by weight of asphalt cement were used as its modifier. A propeller mixer was used for blend- ing the bentonite and asphalt cement. In this study, the rutting performance of modified asphalt mixtures was evaluated through various laboratory tests, such as Marshall stability and permanent deformation The test methods used in this evaluation were the dynamic creep test and wheel tracking tests. The results demonstrated that the use of bentonite can enhance Marshall stabil- ity and resistance to permanent deformation of mix- tures. The mixtures also show good resistance to perma- nent deformation, evaluated by means of wheel tracking tests.