Very high reliability of computer ocntrol system is required in critical applications such as civil aviation and signal control in railway traffic. At present, similar redundant fault-tolerant systems can effectively avoid the non-common stochasticfailures that appear in systems. BUt for ocmmon faults such as errors in hardware design and software coding, this method can ruin the whole system, so dissimilar redundancy technique must be adoptedto overcome those difficulties. In this paper, we introduce a dissimilar fault-tolerant system with software and hardware in detail. A new reliability analysis methodology-Dynamic fault tree analysis(DFTA) is applied to evaluate the system and illustrate the reliability brought by dissimilar redundancy technique.
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