The critical speed of the rice mill spindle were calculated using the finite element method .According to the struc-ture of rice mill spindle system ,the main components of rotor system was determined ,and the two-dimensional spring and damping element was used to model the bearing .Given 5 kinds of working speed (0 ,500 ,1 000 and 1 500 and 2 000 r/min) , after the rotor dynamic analysis ,the Campbell diagram was obtained ,thus the critical speed of the spindle was determined as 725 r/min ,which meant that the spindle could reach the resonan...