With the improving of the speed and efficiency of rotating machinery,the axial clearance becomes smaller and smaller,the possibility of axial rubbing is greatly increasedBut there are few experimental studies focusing on the axial rubbingThe four magnetic disks gas bearing rotor system test bench was built to study the rotor axial rubbing of the high speed permanent magnet machineThe hydrostatic gas bearing was used and two magnetic disks with the same size were arranged on both sides of the bearing in the test benchThe vibration experiments were performed to study the rotor axial rubbing characteristics of the high speed permanent magnet machineThe results show that the opposite trend dual low frequency is occurred when an axial rubbing is happened,and the severity of the axial rubbing will affect the repetition of the frequencyThe stress deformation analysis of the magnetic disks was performed by ANSYS,and the reasons of axial rubbing were givenThe axial gap is small and the disks are subjected to high stress concentration which leads to the axial deformation at high speed.