In order to find and solve the faults in embedded operating system more timely,a fault monitoring system based on domestic embedded operating system is designed and implemented in this paper.The system is mainly composed of three modules: core hardware failure monitoring,software fault monitoring and log management.The system finds the fault through the monitoring function,uses the diagnosis function to analyze the fault,stores the fault information through the log management function,and finally calls the fault handling function to deal with the fault and print the fault information.The test results show that the system can quickly detect the occurrence of the fault and diagnose the correct fault information.After obtaining the fault information,the users can analyze the cause of the fault and locate the fault,so as to solve the fault conveniently.