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The physical fields of synchronous generator are very complicated because of the coupling of electromagnetic field, fluid field and thermal field. In this paper, a large synchronous generator is taken for an example and the three types of fields are calculated. Firstly, the mathematical model and physical model of 2D electromagnetic field are determined by which the losses in each part of the generator are calculated. Secondly, the fluid kinetic differential equations in stator radial ventilation duct are built. After determining the solved region and boundary conditions, the 2D fluid field is computed and the different distributions of fluid field are compared and analyzed when the fluid has different entrance angles. Finally, the 3D stator temperature fields are solved under different inlet angles respectively. The results of the coupled fields are analyzed.