A method of computing the electromagnetic force expression of end windings based on image theory, the Biot-Savart Law, and the superposition principle is proposed for the end structure frame of a large-capacity turbo-generator. On the basis of a 600MW homemade large-capacity turbo-generator, the axial, radial, tangential and resultant electromagnetic force density of the stator end windings′exiting slot part, involute part, and nose part in a pole pitch are computed and analyzed, respectively. The results show that the location of the maximal axial, radial, tangential and resultant electromagnetic force densities acted on the bars in different windings regularly located in the juncture, beginning or ending of the windings. The maximal electromagnetic force density and its location in the exiting slot part, involute part and nose part are obtained. Finally, the torque acting on the nose for the first time is computed, and the location of the maximal torque can be obtained. The results provide some instructive references for the fixture of the binding and online monitoring of the stator end windings.