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The airborne computer is the core component of the UAV, the reliability of the airborne computer influences the survival ability of the whole system. Redundant technology is an important method in airborne computer reliability design. It can improve the adaptability of system, realize avoiding malfunction by error concealment, improve system performance. But there are clock error between different channels, the seamless switching can’t be realized and the system safety will be affected with it. Based on the analysis of non-synchronization between each channels in airborne computer, a synchronization method of software and hardware is put forward. A detailed algorithm design of the tri-redundancy structure in airborne computer is given. The method and strategy is effective to system synchronize, the system asynchronization is satisfied the requirement through actual test with low cost of software and hardware. The reliability and maintainability of system have been improved.