Abstract: The PC to carry on recording and memory is used for the excitation system records in tradition methods, and after debugged in good order, the following records are no longer carried on , it is disadvantage to the later accident elimination and the product renewal. This system can conduct the recording automatically ， gathering, analysis and memory . This article elaborates this memory ' s realization from both hardware and software designs. The system enables automatically rapid collection, analysis and storage of excitation system data in long time.