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In order to improve the safety and reliability of the small unmanned aerial vehicle (UAV), triplex redundancy management technique was adopted by combining software and hardware technology. The hardware architecture of a triplex redundancy flight control computer, which includes serial ports, switch quantity, analog CAN bus, FlexRay bus and expended SRAM as well as some other hardware resources, was designed firstly. When designing the redundancy management part, software voting and hardware arbitration were proposed. To overcome the heavy load and slow communication rate of traditional CAN bus, the FlexRay bus was introduced, and the communication mechanism based on the FlexRay bus was designed. Finally feasibility of the design was verified. In short, the design of triplex redundant flight control computer owns high integration and is easy to upgrade. The FlexRay bus communication functions meet the designed requirements, thus the total design has very high application value. 