Servo drive system Large shipbased is the inner ring of TT&C antenna servo system ,which is the key of the servo system design. Starting from the hardware design, Using the idea of four quadrant operation, This paper designed the siliconcontrolled rectifier amplification system. By zero type threephase rectifier circuit in parallel, the servo drive device is reversible, adjustable steady speed system. We solved the thyristor rectification of defects, implements the effective circulation, harmonic suppression by adopting circulation suppression technology.In order to eliminate the gear clearance, we adopt double transmission chain design. Simulation and practice show that the control strategy has excellent control performance, radar tracking stability quickly.