At present, the majority of tasks about power distribution management are directly executed by the analog signals from flight control computer. With the increasing of load, the weight of cable on the UAV is heavier, and it seriously affects the on load capacity of UAV.In order to improve the reliability of UAV power distribution system and reduce cable weight, the paper focuses on the research of power distribution management computer technology based on bus control and redundant. On one hand, the hardware architecture of the power distribution management computer was proposed based on dual CPU redundancy. On the other hand, the scheme of the software design was put forward from the two aspects of the upper computer debugging software and the lower computer software. Finally, the Markov model of the distribution management computer is established, and the system reliability analysis and calculation are carried out.