Abstract: The ge neral fatigue theory of rolling bearings is unable to predict the failure du e to skidding and skewing of rolling ele ments,which often occur in high speed roller bearings.Accordin g to the hydrodynamic lubrication and EH L theory,a model of interaction among rolling elements is est ablished.The dynamic model of roller bearings is also established according to the second Newton law.B y means of the program provided in the papar,it is possible to calculate the load distribution,oilfilm thickness and fatigue life of roller bearings,and to simulate dynamically the skidding of rollers and cage,the skewing and axial motion of rollers.Hence,a new effective tool of design and failure analysis is provided for high speed roller bearings.