The development and application of the rotor solid magnetic pole structure of TSK6500-6 type 6 500 kW, 10 kV three-phase synchronous motor are introduced. By changing the connection mode of the “T-tail” structure between the magnetic pole and the magnetic yoke, the reliability and safety of the motor operation are improved, and the processing difficulty is reduced. The research results verify the effectiveness of the proposed measures. This research could provide reference for the design of rotor structure of large synchronous motor.