The block specimen (316L) and the disk specimen (40CrMo) which constituted a blockondisk friction pair was used for the rotating friction test.The phenomenon of tribomagnetization of the 40CrMo disk specimen was discussed.The effects of the sliding speed and load on the tribomagnetization of the disk were investigated.The results show that as the sliding speed increases,the magnetic field of friction surface is gradually increased under heavy load.With the increase of load,the temperature of friction near surface rises rapidly,the demagnetization phenomenon caused by frictional heat is more obvious,and the increment of magnetic field on the friction surface is increased firstly and then decreased.Under heavy load,the temperature of friction near surface will exceed 150 ℃,which causes that the increment of tangential magnetic field is decreased or even becomes negative value on the friction surface.