给出了一种井下排水泵微机监控系统的容错设计方案，其特点是在功能板级进行混合冗余设计，便于工程实现．利用马尔可夫模型对系统做出的可靠性分析及实验表明，其运行５ａ的可靠度仍在０．９以上，明显优于常规系统． A fault-tolerant design scheme of computer monitoring system for downhole drainage pump is given, which is characterized by mixing and redundancy design at the function board level, which is convenient for engineering implementation. The reliability analysis and experiments on the system using Markov model show that the reliability of its running 5a is still above 0.9, which is obviously better than the conventional system.