A model for the flow rate distribution of the radial ventilation in stators was built,taking the axial sectional type radial ventilation system of a turbo-generator stators as a research example.Considering the flow volume dependency between the ventilation zones in the stator,the confluence point and the diversion point were determined according to the pressure balance between ventilation zones so as to make the results more practical by the model.The fluid field of an air-cooled turbo-generator stator was analyzed based on the model.The results were compared with the experimental results,which shows that the accuracy meets the need in engineering,and the model was verified.