Abstract: In view of shortcomings of dual-computer hot standby scheme of existing coal mine monitoring and control system such as high investment cost of storage devices, relative poor reliability and complex algorithm for data recovery, a data synchronization software of dual-computer hot standby based on pure software model was designed. On the basis of practical application of coal mine monitoring and control system, monitoring data synchronization function was independent from the dual-computer hot standby system as an independent software. The software reduces complexity of synchronization algorithm and synchronization content of dual-computer hot standby, and improves reliability of dual-computer hot standby.