In view of the problems existing in China's fault recorders such as discontinuous recording data， single functions and difficult analysis， a fault recording and monitoring system based on multi-processor synchronous control is studied. The execution time of each processor and interface speed between modules are calculated. An overall planning method is given to process fault data with high priority while considering the task with lower priority at the same time. By synchronously controlling the logic switching between the module internal and interface tasks and reserving certain time margins， the integrity and continuity of recorded files and the accuracy in recording data can be ensured. By implementing parallel multi-function processing of the fault recording system， long-term effective monitoring of the power grid can be carried out.