为了确保高的可用性 ,在重大工程实践中往往采用具有容错结构的计算机双系统。双系统处理得到两个结果的异同性 ,历来是研究双系统容错的技术重点和难点。文章在双系统可用性分析、结果判错与选择、以及双工切换技术方面都有突破性的进展 ,并在重点工程中得以实现 ,取得显著效果 In order to ensure high availability, dual computer systems with fault-tolerant structures are often used in major engineering practice. Dual-system processing to get the similarities and differences between the two results has always been the focus and difficulty of the study of dual system fault tolerance technology. The article has made breakthrough progress in the analysis of dual system usability, the judgments and choices of results, and the technology of duplex switching, and achieved significant results in key projects