Abstract: In order to meet the requirements of General Technical Requirements of Coal Mine Safety Monitoring System and General Technical Requirements of Coal Mine Underground Operations Personnel Management System, the system must has the function of dual computer switching, and realize the function of automatic monitoring and automatic switching between two hosts. Using VS2010 development platform, C# advanced programming language, combined with multithreading technology, the paper designs a set of software switching system. According to the main performance test method in MT/T772-1998 8.13, the software system has the function of software self-monitoring,and can satisfy the general technical reguirement that the wording time from the host to the backup host is less that 5 min, and complete the automatic switching between two computer software and achieve unmanned dual computer function.