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Aiming at the problem that it is difficult to close the loop in time when domestic special computers have occasional failures, innovatively put forward relevant technologies for logging the whole process of computer operation. From both software and hardware aspects, a log recording system for the whole process of computer operation is designed and implemented, which solves the problem of log recording in the stage from power on to the completion of the operating system startup of domestic computers. Finally, the experiment is carried out to verify that the designed system can accurately reflect the state information of the whole process of computer operation. It shows that the system is helpful for fault location, mechanism analysis, fault recurrence, taking measures and verification, and finally complete the fault closed loop.