We design a servos control system based on three C8051F020 arbitration hot backup. C8051F020 is completely integrated of hybrid signals system on chip, provided with a high speed pipeline structure. The instruction execution speed is greatly improved compared with standard MCS51, and the introduction of digital cross switch technology makes the allocation of system resources reasonably. It can control the actuator accurately by collecting and calculating a large number of sensor data out to the actuator control board. For the arbitration hot backup technology, we design fault detection module, communication module, dual engine arbitration switching module and servo drive module. Two CPUs communicate through double port RAM. In addition, communicating with the arbitration microcontroller serial greatly shorten the switch time, reduce the system failure rate and improve the systems reliability and stability.