The study of the generation and transfer process of the heat in bearings can provide theoretic support for the research of thermal unstability of dynamic oil film of bearings.Heat transfer model of thermal nodes was built for the ball bearing which was lubricated by oil air or oil mist.The temperature field calculation model was established with the thermal network method,and the temperature for each node was calculated with considering of effects of the rotational speed,the load,the centrifugal force and the spinning of the bearing on the temperature rise.Results show that the heat generation of angular contact ball bearings is related to spinning,centrifugal force,load and rotational speed.Higher speed and heavier load will lead to higher temperature rise.Along with the increasing of rotational speed,effects of spinning and centrifugal force on temperature rise are increased.Therefore,effects of the centrifugal force and spinning on the temperature field can not be neglected,especially in high speed bearings.