Abstract: In CTCS-2 and CTCS-3 Train Control Systems, The driver monitors and adjusts the train running status through observing and operating the DMI equipment. But the wrong operation and DMI equipment failure could cause the Train Control System fault, and the train delay. In order to reappear driver’s operations and on-board equipment faults, it was needed to provide a system of reappearing DMI operation process. This paper introduced the system frame and basic principles of the DMI Operation Reappearing System, described the useful information which was included in the DMI logs, introduced four typical applications about reappearing the DMI defaults, debugging the DMI software, displaying the DMI functions and testing the DMI functions automatically.