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The requirement of rudder servo system for aerospace vehicle is getting higher, not only strong bearing capacity and small quality, but also high reliability and convenient maintenance. In response to such requirements, the rudder servo system for aerospace vehicle is designed. Electrical dual-redundancy control and dual-winding permanent synchronous motor are the key technologies. The diver adopts the combination of 1553B bus, CAN bus and 422 bus, which solves the communication problems with flight control, system interior and test equipment. Actuator adopts double redundant gear pair and ball screw pair direct drive mechanism, and the locking function of the rudder surface is realized by locking the motor shaft, which improves the reliability of the system. The co-simulation analysis of the system is carried out, and the results meet the requirements. The rudder servo system meets the performance requirements of aerospace vehicle through the practical applications in spaceflight general unit.