Determining　the　parameters　of　angular　contact　ball　bearings　under　preload　is　the　key　issue　to　improve　the　accuracy　and　performance　of　high-speed　spindle.　The　impact　of　gyro　force　and　centrifugal　force　were　considered,　a　static　and　a　dynamic　model　for　angular　contact　ball　bearings　under　rigid　preload　were　presented.　By　using　Newton　iterative　method,　dynamic　parameters　of　the　angular　contact　bearings　were　obtained,　including　eccentricity　of　contact　ellipse,　contact　angle,　contact　force,　maximum　contact　stress,　contact　ellipse　radii　and　stiffness,　etc.　According　to　numerical　simulation,　relationship　between　the　parameters,　versus　preload　and　versus　rotation　speed　were　given.　The　results　reveal　that　the　stiffness　increases　as　the　preload　increases　appropriately,　the　contact　stress　and　contact　ellipse　radii　increase　as　the　preload　increases　excessively.　In　addition,　under　rigid　preload　this　model　has　no　bearing　softening　effect.　This　method　provides　valuable　theoretical　basis　for　further　researches,　such　as　calculating　bearingscalorific　value,　calculating　bearings　fatigue　life　and　optimizing　bearings　structure,　etc.